Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd93224ba85711be…

MALICIOUS

PDF

40.9 KB Created: 2020-10-07 07:09:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: b283c4e557b2ddec257a211b2cb12301 SHA-1: 308427625e64d4db57bdbd8ad346594b6637c7d8 SHA-256: fd93224ba85711be435bdf416ac4af8d4503ea147f8aee2f915977fc7fd947b7
234 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://gettraff.ru/strik?keyword=exercices+corrig%25C3%25A9s+sur+les+filtres+actifs+pdf In PDF document text
    • http://dugoxowi.swirlcupcakes.org/uploads/1/3/0/7/130776525/0d72287be2ea5c8.pdfIn PDF document text
    • http://files.charlotteandcompany.net/uploads/1/3/2/3/132302754/3802813.pdfIn PDF document text
    • http://files.tasteofmansfieldct.org/uploads/1/3/1/6/131606674/pojabemadol.pdfIn PDF document text
    • http://files.spencer-amaral.com/uploads/1/3/2/6/132681690/xezimili.pdfIn PDF document text
    • http://files.genesisfamilyempowermentsociety.com/uploads/1/3/1/4/131453124/wupup.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0482/1116/5336/files/60305588495.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4639/6326/files/dell_inspiron_7559_charger.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/2059/4583/files/tank_trouble_hacked_unblocked_66.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2723/3959/files/pixonuvonuromifur.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5150/8131/files/vma_final_boss_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6146/9596/files/fekex.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/9385/5907/files/84343382578.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5123/8047/files/40071972606.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6744/0294/files/hankook_dynapro_atm_rf10_off-road_tire.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/6809/9234/files/balboa_vs500z_service_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/0290/3714/files/millionaire_to_billionaire_unblocked_hacked.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0718/7872/files/food_inc_movie_sheet_answers_fast_food_to_all_food.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5895/3369/files/rapikigok.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004f32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4F32 5264 bytes
SHA-256: ec8077d6ec385e41e2d86b5f0cfc131ba051523cc7444581968f9ef9d7eda8ed
font_01_sfnt_off000060f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60F7 11348 bytes
SHA-256: bdca830ff8fffc4e4aaaec1e9e11d06839beae680b3a2967c036462f5e46001e
font_02_sfnt_off000085b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85B0 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333