Malicious PDF — malware analysis report

Static analysis result for SHA-256 70c701d906f324e3…

MALICIOUS

PDF

38.9 KB Created: 2020-08-10 14:56:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 93e0c63561b2ed2a3ce37be8cd7ca34a SHA-1: 1fbbcc667a10365141b00e048bccb473347c5294 SHA-256: 70c701d906f324e367be2a1c634d5f8d82310f7e8f24e9e3d3192047ae177458
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically the URL https://ttraff.com/pify?keyword=ielts+actual+reading+test+pdf. The document body also contains this URL and a large number of other PDF links, suggesting a link farm or SEO poisoning attempt. The ML classifier also strongly flagged this PDF as malicious.

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.com/pify?keyword=ielts+actual+reading+test+pdf
    • http://files.riveredgepubliclibrary.org/uploads/1/3/2/6/132681749/6333078.pdf
    • http://files.mequonumc.org/uploads/1/3/1/4/131406717/xedobomomibumuzu.pdf
    • http://files.losalamitosunit716.org/uploads/1/3/0/8/130814127/xebura-vefasu-tonilekurokom-wegusodejabe.pdf
    • http://jojuw.art63lynch.com/uploads/1/3/1/4/131406436/vivew.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/0588/5090/files/fanukexafugakiluni.pdf
    • https://cdn.shopify.com/s/files/1/0454/6779/5608/files/algebra_2_factoring_polynomials_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0435/5935/4517/files/netgear_ex2700_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/7981/1750/files/61252489071.pdf
    • https://cdn.shopify.com/s/files/1/0428/7699/3702/files/paula_isabel_allende_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/1006/4537/files/3496678867.pdf
    • https://cdn.shopify.com/s/files/1/0431/1964/0738/files/raliwuse.pdf
    • https://cdn.shopify.com/s/files/1/0433/4243/0362/files/gemex.pdf
    • https://cdn.shopify.com/s/files/1/0432/6617/9230/files/burapufafofafo.pdf
    • https://cdn.shopify.com/s/files/1/0429/8250/6647/files/livro_bauman_amor_liquido.pdf
    • https://cdn.shopify.com/s/files/1/0432/4953/3088/files/41687269719.pdf
    • https://cdn.shopify.com/s/files/1/0433/6815/3239/files/acute_myeloid_leukemia_aml.pdf
    • https://cdn.shopify.com/s/files/1/0437/4672/1946/files/scott_pilgrim_vs_the_world_game_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/5346/6271/files/ranozojipusarujoduvoz.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b1a.bin
ccccca43bf6aaa99e34e9227ae7880e33a86023564573a309e47c29e663d9f5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B1A 5260 bytes
font_01_sfnt_off00006d04.bin
8b3f9ff465ba03c5ad14ec31994de0bf0f1ccd8715f68d6a1ebf672ae0ff02b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D04 9720 bytes

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