Malicious PDF — malware analysis report

Static analysis result for SHA-256 085d7e0d93de55cf…

MALICIOUS

PDF

38.4 KB Created: 2020-08-21 00:21:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b6b22b97c634449cd819dae6e275c05f SHA-1: 2e1c625b87fb788998eff99e28d675b7136024bf SHA-256: 085d7e0d93de55cfbd9ea0aed806e6e36f5ca3cca7354f1ef04027df6c333762
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to Shopify domains hosting other PDFs, but one critical link directs to a known malicious redirector. The document body, though partially corrupted, includes the text 'Grammar test questions with answers pdf' and the malicious URL, suggesting a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is used for phishing or malware distribution.

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=grammar+test+questions+with+answers+pdf
    • http://lovul.lotusranch-homes.com/uploads/1/3/1/4/131454215/savupuvesun-jorunazan-muwamanija.pdf
    • http://robasovav.scarfitup.org/uploads/1/3/1/4/131437886/7dd15fd2962cb.pdf
    • http://files.treeblacksmith.com/uploads/1/3/1/6/131606118/tipar.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/5699/6247/files/mozomosa.pdf
    • https://cdn.shopify.com/s/files/1/0429/0235/6127/files/48490258648.pdf
    • https://cdn.shopify.com/s/files/1/0428/9947/2550/files/puporelosukepifigaj.pdf
    • https://cdn.shopify.com/s/files/1/0438/2241/6029/files/general_comments_for_elementary_report_cards.pdf
    • https://cdn.shopify.com/s/files/1/0429/8863/4266/files/3d_reader_for_mobile.pdf
    • https://cdn.shopify.com/s/files/1/0431/0165/1105/files/formative_vs_summative_assessment_chart.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/4155504299.pdf
    • https://cdn.shopify.com/s/files/1/0440/8980/2904/files/jawugejivezutikitaziwem.pdf
    • https://cdn.shopify.com/s/files/1/0435/4477/2757/files/japan_guide_kyoto_gion.pdf
    • https://cdn.shopify.com/s/files/1/0438/9378/4728/files/27880052348.pdf
    • https://cdn.shopify.com/s/files/1/0434/1760/0165/files/nc_dmv_driving_test_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/7813/1611/files/euripides_medea_play.pdf
    • https://cdn.shopify.com/s/files/1/0427/7207/0556/files/lokawobakanagevazawejusu.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_off000056fe.bin
e02419c5979ec57f1f23fe3623a72733137edf36370eee76827f14195ca5e10c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56FE 5500 bytes
font_01_sfnt_off0000699c.bin
d497e71f5e6fb97b818696fa5907fd035bf8f7d4eb71d83f1b21bd7afaecfb8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x699C 10264 bytes

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