Malicious PDF — malware analysis report

Static analysis result for SHA-256 70fd44e6ab8c391d…

MALICIOUS

PDF

53.5 KB Created: 2020-08-18 23:00:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9f20a029ed9ab97d01cb03bec47f237b SHA-1: 9555a2b4ab754cd54417002e62f089151fab6b76 SHA-256: 70fd44e6ab8c391dc77e7576ef53bfd70b2cd7ea95086bdc14bb66265c32bd5d
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, disguised with a search query. It also features a large number of external PDF links, many pointing to Shopify, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs confirms the intent to lead the user to external, potentially harmful, content.

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.cc/pify?keyword=bleacher+report+summerslam+results
    • http://files.assortedartistries.net/uploads/1/3/2/6/132680860/zimetijofew.pdf
    • http://files.standrewci.com/uploads/1/3/2/6/132680813/garuzenatiwovem.pdf
    • http://files.glennartfarm.com/uploads/1/3/0/9/130969509/a6982d00549.pdf
    • http://files.semoswatchallenge.com/uploads/1/3/0/8/130873893/sinopanerajenezeves.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/4164/3928/files/publisher_booklet_templates_free.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/puneson.pdf
    • https://cdn.shopify.com/s/files/1/0429/8866/7039/files/rabenizu.pdf
    • https://cdn.shopify.com/s/files/1/0438/0921/0529/files/hp_designjet_t2530_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/0593/4757/files/human_schistosomiasis.pdf
    • https://cdn.shopify.com/s/files/1/0433/5511/1589/files/89789436275.pdf
    • https://cdn.shopify.com/s/files/1/0432/1440/5793/files/42732302207.pdf
    • https://cdn.shopify.com/s/files/1/0431/2639/0946/files/75170959031.pdf
    • https://cdn.shopify.com/s/files/1/0430/3729/4745/files/14781011475.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xorufolikuvuzinekotawoxo.pdf
    • https://cdn.shopify.com/s/files/1/0430/5698/8317/files/cds_exam_syllabus_2020_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/0438/7750/files/ritax.pdf
    • https://cdn.shopify.com/s/files/1/0429/9502/4023/files/shala_marathi_book_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4899/files/psychrometric_chart_nptel.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000086af.bin
298330e79c5975e64bc3ec40a784b04e97b5e8da47e1e869d94ec0f51a87bde5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86AF 4948 bytes
font_01_sfnt_off00009780.bin
e2520f5dae1dd2232094f051b2a048a4d9455b2352187d1325b3f6042e367606		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9780 10316 bytes
font_02_sfnt_off0000baaf.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBAAF 4324 bytes

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