Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ffa5a2380d1450d…

MALICIOUS

PDF

42.8 KB Created: 2020-10-04 07:49:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 952266e38b519fc765b44d39844ef15a SHA-1: 3bc0bc5931885f09ac5236ec50ef1170a13e040f SHA-256: 4ffa5a2380d1450d4f6dc94784f654206c9e96e36c30fd8ea02a885cd3b1594a
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://ggtraff.ru/strik?keyword=timer+30+sec In PDF document text
    • http://guganapi.spanishfluencyacademyforyoungsters.com/uploads/1/3/1/4/131437490/tulupive-bezej-maxemo-risopimuwaveg.pdfIn PDF document text
    • http://files.kevaneymartin.com/uploads/1/3/1/4/131453615/1405269.pdfIn PDF document text
    • http://jisit.crazyloveafricashop.com/uploads/1/3/2/7/132710621/pedojuzorijez.pdfIn PDF document text
    • http://files.dovernewlife.org/uploads/1/3/0/7/130739043/nejeruxokevuv-genexaxovupuk.pdfIn PDF document text
    • https://site-1037115.mozfiles.com/files/1037115/53920744356.pdfIn PDF document text
    • https://site-1036814.mozfiles.com/files/1036814/26945539057.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/1/0429/5639/0559/files/convert_1_135_mm_to_inches.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/4176/2727/files/96984111753.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2435/8298/files/60276541082.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0461/7194/7161/files/hp_deskjet_2540_manual_wireless_setup.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/6433/0906/files/two_flats_key_sig.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4183/9514/files/80978701152.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/2083/1904/files/wuzezazenikufow.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_off00005df7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DF7 4448 bytes
SHA-256: 95f3cf01273f9f19de5573900ec7722202a4da399e67a595afb71d9c87794c72
font_01_sfnt_off00006cf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CF9 10412 bytes
SHA-256: f900c5d137eef84e06241126fdb441d28d3be11b00bbaa95c171806bfc5ad09e
font_02_sfnt_off000090a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90A2 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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