Malicious PDF — malware analysis report

Static analysis result for SHA-256 a957160a29a07cb5…

MALICIOUS

PDF

45.2 KB Created: 2020-09-19 07:50:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 0e7769caf627dae0f32e9f585b02b360 SHA-1: 219d749bd50183541a24c08ff546c652abe1a204 SHA-256: a957160a29a07cb5f44d1158e620355470127811722b321e0badfacae9361216
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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://ttraff.com/wix?keyword=lease+early+termination+clause+wording In PDF document text
    • http://zatega.redstarbarnridingacademy.com/uploads/1/3/0/9/130969422/7813105.pdfIn PDF document text
    • http://files.roofingwithmaize.com/uploads/1/3/0/9/130969654/wabagejov-lesajigusumed-busamef-sepedefifobeza.pdfIn PDF document text
    • http://files.richquinlan.com/uploads/1/3/0/9/130969211/virelekig-mavis-mupagup.pdfIn PDF document text
    • http://files.mellavin.com/uploads/1/3/0/7/130775952/jujojesag_sakufuxejitedi_xibekaxime_buxixo.pdfIn PDF document text
    • http://files.patriciagodden.com/uploads/1/3/1/4/131483019/5adf2.pdfIn PDF document text
    • http://poriru.pamperandpreen.co.uk/uploads/1/3/1/3/131380213/zosipuvaposiso.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8714/2818/files/tutorial_adobe_premiere_pro_bahasa_indonesia.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4145/5254/files/89642055567.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1186/4738/files/74834536875.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9492/4700/files/sims_4_parenting_skill_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1274/9469/files/transport_in_cells_biology_answer_key.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5842/9078/files/voy_areir_voy_a_bailar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7752/3861/files/hindi_ring_tone_free.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000072ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72FF 5396 bytes
SHA-256: 67cce265ab482a77727c07d8b4415ae140863ea4d49ba8cc41e0719856bba9fc
font_01_sfnt_off0000855d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x855D 10068 bytes
SHA-256: cf71ba4b75110b8a4cb2189465d134867a345736cc4dd6e40943b26fe7bb130b