Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a4bbabe4ad105f8…

MALICIOUS

PDF

40.0 KB Created: 2020-08-01 04:16:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf55d855289e8d73be774e37b57df505 SHA-1: 6ec403fd17a20ece0fee998545017e61bd8bb7cc SHA-256: 9a4bbabe4ad105f839c079ecd31e9e1dfc1848de3b71c9e5a4dbec3516330c7b
152 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and contains a large number of external links, many hosted on Shopify. One of these links, 'https://ttraff.com/pify?keyword=%25D1%2581%25D0%25B2%25D0%25B5%25D1%2582+%25D1%2582%25D0%25B2%25D0%25BE%25D0%25B5%25D0%25B9+%25D0%25BB%25D1%258E%25D0%25B1%25D0%25B2%25D0%25B8', is a known malicious redirector. This suggests the document is designed to lure users to malicious sites through a link farm. No scripts were extracted from this sample.

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=%25D1%2581%25D0%25B2%25D0%25B5%25D1%2582+%25D1%2582%25D0%25B2%25D0%25BE%25D0%25B5%25D0%25B9+%25D0%25BB%25D1%258E%25D0%25B1%25D0%25B2%25D0%25B8
    • http://files.centennialtimberframes.com/uploads/1/3/1/6/131636916/jalomobem.pdf
    • http://files.kristinayee.com/uploads/1/3/1/4/131406827/9432029.pdf
    • http://files.trudybellepartybox.com/uploads/1/3/1/6/131606502/tegakokekubek-kelaravutev.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wowivitotorinu.pdf
    • https://cdn.shopify.com/s/files/1/0436/7079/8489/files/80297080442.pdf
    • https://cdn.shopify.com/s/files/1/0431/5856/9120/files/givuwunofu.pdf
    • https://cdn.shopify.com/s/files/1/0435/8144/0168/files/27771014865.pdf
    • https://cdn.shopify.com/s/files/1/0431/0342/0570/files/6592138536.pdf
    • https://cdn.shopify.com/s/files/1/0435/2458/7674/files/13361586853.pdf
    • https://cdn.shopify.com/s/files/1/0431/1184/1958/files/15986554547.pdf
    • https://cdn.shopify.com/s/files/1/0436/7246/9669/files/97074427375.pdf
    • https://cdn.shopify.com/s/files/1/0429/1434/9219/files/sapply_in_r.pdf
    • https://cdn.shopify.com/s/files/1/0435/8511/0171/files/19577322966.pdf
    • https://cdn.shopify.com/s/files/1/0430/2818/5239/files/44474355453.pdf
    • https://cdn.shopify.com/s/files/1/0431/8016/3227/files/31325127626.pdf
    • https://cdn.shopify.com/s/files/1/0433/0484/5465/files/texadewarile.pdf
    • https://cdn.shopify.com/s/files/1/0429/6785/9359/files/wonamikopapotiwojijab.pdf
    • https://cdn.shopify.com/s/files/1/0431/3127/3383/files/15500602833.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_off0000540a.bin
72b8503d5039afe5846c7131d4dfd14777e9f57e48a275fce361e1503f657fa1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x540A 5192 bytes
font_01_sfnt_off000064d1.bin
b7a8bc9306e37e3b33333b67b932199790c4be198ef7dc6e1c7a63eb2c4f1f01		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64D1 14052 bytes

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