Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f8ad58f5cb34dee…

MALICIOUS

PDF

54.8 KB Created: 2020-08-10 08:26:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fccf8521f1f9371d76318e884c00df5d SHA-1: 46af0a4859ef7c6e30129189fdb64fa6b4904ab8 SHA-256: 9f8ad58f5cb34deec6154785af3a91aaea47180c7664ba53f8d680d379a516b4
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a mass of external links, many pointing to Shopify domains, but one critical link redirects to a known malicious redirector. The document body, though obfuscated, contains the URL that triggered the malicious redirector heuristic. This suggests the primary goal is to drive traffic to malicious infrastructure, likely for further exploitation or phishing.

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.ru/pify?keyword=acidosis+metabolica+caso+clinico+pdf
    • http://files.superiordesignshairsalon.com/uploads/1/3/2/6/132683000/4c7996641.pdf
    • http://files.lilabahlphotography.com/uploads/1/3/1/8/131872037/7018358.pdf
    • http://files.elitez.org/uploads/1/3/1/3/131384468/wezuwevitutinez_zuruwili.pdf
    • https://cdn.shopify.com/s/files/1/0429/7388/8671/files/12185319111.pdf
    • https://cdn.shopify.com/s/files/1/0433/8991/1196/files/10214450515.pdf
    • https://cdn.shopify.com/s/files/1/0431/7013/6218/files/attachment_focused_family_therapy_workbook.pdf
    • https://cdn.shopify.com/s/files/1/0436/4887/6702/files/nifumitevomup.pdf
    • https://cdn.shopify.com/s/files/1/0439/2160/4763/files/molokajerirorurinena.pdf
    • https://cdn.shopify.com/s/files/1/0427/9179/6902/files/siwesopojilomojo.pdf
    • https://cdn.shopify.com/s/files/1/0437/0500/8293/files/41120248265.pdf
    • https://cdn.shopify.com/s/files/1/0428/1548/8163/files/learning_php_the_hard_way.pdf
    • https://cdn.shopify.com/s/files/1/0433/6844/8151/files/justin_bieber_i_m_sorry_mp3.pdf
    • https://cdn.shopify.com/s/files/1/0428/2315/5878/files/95271973229.pdf
    • https://cdn.shopify.com/s/files/1/0433/3115/8175/files/geographical_map_of_bihar.pdf
    • https://cdn.shopify.com/s/files/1/0431/0574/7095/files/plot_shapefile_in_r.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000088a2.bin
db80b84d9b6f7ddc303aea7c0296bbde3abfe39b80280b160dcd9d0ed293d164		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88A2 5120 bytes
font_01_sfnt_off000099e8.bin
575669f1e826226271975d730c27b8ad332cf943f4e38489363a12add8ab0ed9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99E8 11108 bytes
font_02_sfnt_off0000bfcf.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBFCF 4324 bytes

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