Malicious PDF — malware analysis report

Static analysis result for SHA-256 d91dad2f8a8921db…

MALICIOUS

PDF

38.3 KB Created: 2020-08-20 20:06:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34b6b3ff013f91e2147f201da5784c33 SHA-1: f36dd9bd6dc8d2f51917002c0c9d9205d17a77d7 SHA-256: d91dad2f8a8921db716ec16e0158ba30bc35fc58d50c59c5405f4ba45f8b061b
152 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and contains numerous embedded links. One critical heuristic identified a link to a known malicious redirector, ttraff.com, which likely serves to obscure the ultimate malicious destination. Another critical heuristic indicates a PDF link farm, with many links pointing to shopify.com domains, suggesting an attempt to manipulate search engine results or distribute content. The document body contains the redirector URL and several other embedded URLs, reinforcing the link-based attack vector.

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=chomp+chomp+fragments+exercise+5+answers
    • http://wureporul.uccststephens.net/uploads/1/3/1/3/131383373/nipilanaz-zugefor-davusifezum.pdf
    • http://files.zwrestletalk.com/uploads/1/3/1/6/131607600/gokavojinosi-mijadojajifasa.pdf
    • http://files.52choices.com.au/uploads/1/3/2/6/132681928/jasanaxatuxi.pdf
    • https://cdn.shopify.com/s/files/1/0437/7506/6273/files/eating_attitudes_test_26.pdf
    • https://cdn.shopify.com/s/files/1/0434/1448/7190/files/activator_office_2010_windows_10.pdf
    • https://cdn.shopify.com/s/files/1/0440/2341/4942/files/xbox_360_gta_v_modded_game_save.pdf
    • https://cdn.shopify.com/s/files/1/0431/9097/6673/files/mixemegagonisotidit.pdf
    • https://cdn.shopify.com/s/files/1/0431/1734/6976/files/24790114572.pdf
    • https://cdn.shopify.com/s/files/1/0431/0266/6906/files/nefijobulevuvupadupijik.pdf
    • https://cdn.shopify.com/s/files/1/0439/0689/1931/files/bukoguzejejudeva.pdf
    • https://cdn.shopify.com/s/files/1/0431/1298/8821/files/zedozaf.pdf
    • https://cdn.shopify.com/s/files/1/0438/4518/9797/files/go_battery_saver_pro_apk_free.pdf
    • https://cdn.shopify.com/s/files/1/0429/5180/3039/files/zuxutugiz.pdf
    • https://cdn.shopify.com/s/files/1/0433/0799/1208/files/xigakovovabinefaj.pdf
    • https://cdn.shopify.com/s/files/1/0431/9395/8560/files/zakafifegotifeful.pdf
    • https://cdn.shopify.com/s/files/1/0431/7826/2689/files/sovotovobolozenap.pdf
    • https://cdn.shopify.com/s/files/1/0429/6353/3977/files/swatch_irony_chronograph_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/2213/9041/files/2084467468.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000053e7.bin
179e803f7f997d26ce0c8eb60c1a60cf5de21bf28d86de24439cfd9d1b1222aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53E7 5584 bytes
font_01_sfnt_off000066de.bin
5c1c65c6e8d0d6b817213c4d32e3ea43c5d3fd29fa715ab32c27ea60f2190ddd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66DE 10848 bytes

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