Malicious PDF — malware analysis report

Static analysis result for SHA-256 d80079a48e831cc6…

MALICIOUS

PDF

41.5 KB Created: 2020-09-12 07:53:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 8c736d06f3380722767f44061cce6668 SHA-1: 031c8e62861d95ca5aeb6b25cb158f2f0493d9c6 SHA-256: d80079a48e831cc6a36e2511bfcdd75869f0ee96c4269f10b12e57a558d124c4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a link farm or content hosting strategy. The ML classifier also strongly flagged this PDF as malicious. The primary malicious IOC is the redirector URL.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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.club/wix?keyword=horizontal+and+vertical+stretch+and+compression+worksheet In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/bcd086_9cc87c40ab884037918368b892c0c3d1.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b148e5_9feb862208684bb1a243725948779c41.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/39cb9d_deefb5d859ba4c3a8aa9b73e2656acdf.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/de60da_adefc0f19bc34d40a89b8618a1d7f51f.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7679/4021/files/street_fighter_anime_movie.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kesazemoluvumexon.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5851/1510/files/gebowibiputozakesimijego.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0586/0248/files/30326066166.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7616/5536/files/calculus_early_transcendentals_11th_edition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6393/4109/files/vizabarulidofuvawax.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2973/2248/files/balancing_redox_reactions_practice_problems.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/d017d5_454dd7e5fa964948b1246efc139fb041.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/d162e3_31ca43f9eb1a45718aa424d5c54a6972.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/11baf9_263519b55554494caa0b6786e052ffc8.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/eb6612_2673978613974a9e81fe6570c622d746.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/66c878_688f773d432046c88d59e06b52a4f27f.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_off000060d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60D2 5540 bytes
SHA-256: 203a72b2512c1e59ba15a02a04e6f839e754dadc38c5f690bc230d9d9f23cc8e
font_01_sfnt_off0000739a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x739A 10752 bytes
SHA-256: d2fbe7bf68a5fc27d855b7a101cca86066fac3b7ec31eaf598ec6db5fba9c6f9

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