Malicious PDF — malware analysis report

Static analysis result for SHA-256 9de26f0983ca9f8f…

MALICIOUS

PDF

45.3 KB Created: 2020-08-07 14:50:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15615cc85fde95c6b441678f2d39a2cd SHA-1: efea0cc2251ac39347261a269f7d4d99306828f2 SHA-256: 9de26f0983ca9f8fd5d68894743a363bd7e4b47596802770f7bec63fd76138c5
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, many hosted on Shopify. The document body, though partially corrupted, contains the same suspicious URL. The primary intent appears to be luring the user to a malicious site via the embedded link.

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=fobia+social+en+ni%25C3%25B1os+pdf
    • http://files.allsortspreschool.com/uploads/1/3/1/3/131379828/d0bc59cbd1.pdf
    • http://files.quicktan423.com/uploads/1/3/0/8/130874086/guletut-zebub-jepuvez.pdf
    • http://files.vargislab.com/uploads/1/3/1/4/131437445/livenoxu_dagaxowila_redejod_fujiti.pdf
    • http://files.eastsuperiorcc.com/uploads/1/3/1/0/131070009/buwugedurutusi.pdf
    • https://cdn.shopify.com/s/files/1/0433/5920/7579/files/gidugisajizozategegekekek.pdf
    • https://cdn.shopify.com/s/files/1/0428/0041/4883/files/3133071676.pdf
    • https://cdn.shopify.com/s/files/1/0434/0904/7708/files/ffxiv_dps_counter.pdf
    • https://cdn.shopify.com/s/files/1/0438/4971/1781/files/91043224276.pdf
    • https://cdn.shopify.com/s/files/1/0431/5270/3645/files/92835610236.pdf
    • https://cdn.shopify.com/s/files/1/0439/8232/3870/files/16196206421.pdf
    • https://cdn.shopify.com/s/files/1/0433/4157/8399/files/compound_adjectives_list.pdf
    • https://cdn.shopify.com/s/files/1/0428/6690/1148/files/fogakavumipulijetabojusiw.pdf
    • https://cdn.shopify.com/s/files/1/0429/6415/6575/files/punamakunegededodabe.pdf
    • https://cdn.shopify.com/s/files/1/0430/6649/1042/files/86297159226.pdf
    • https://cdn.shopify.com/s/files/1/0437/7794/9848/files/76144010072.pdf
    • https://cdn.shopify.com/s/files/1/0439/8333/9678/files/mutoget.pdf
    • https://cdn.shopify.com/s/files/1/0429/9423/7599/files/lixugezawa.pdf
    • https://cdn.shopify.com/s/files/1/0431/8694/6206/files/47855039843.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_off0000669d.bin
b141759c89773b3d46c53aeb6c6d19e2763de444444d983afaf03a42ce5f4e6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x669D 5068 bytes
font_01_sfnt_off0000778f.bin
bfc42bfe6145815a88aaff9f0807be0cda5fdbc2663d7c29098efe6e9b8120c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x778F 10028 bytes
font_02_sfnt_off0000982f.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x982F 4324 bytes

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