Malicious PDF — malware analysis report

Static analysis result for SHA-256 f22b9b4410acb936…

MALICIOUS

PDF

50.1 KB Created: 2020-08-16 16:16:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e2829b622e6c858680efe5b34fa2fbf2 SHA-1: 85aca28e49a09bdaa3b891341fa71f8a71773ec5 SHA-256: f22b9b4410acb9367be99196e974787c2f63a033de4942983d21a54f6b5635af
154 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, which is also present in the document body. The document body text, though partially corrupted, suggests a lure related to '4 hour drug and alcohol course answers'. The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm strategy. The ML classifier strongly flagged this PDF as malicious.

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=4+hour+drug+and+alcohol+course+answers
    • http://tuxosef.stresscafe.com.au/uploads/1/3/1/4/131407005/xodubu.pdf
    • http://files.addressphonelist.com/uploads/1/3/0/8/130813427/riferejip_viluzopebazofad_bepuxoxa_dakavozedeza.pdf
    • http://repire.phonecharmed.com/uploads/1/3/1/4/131438869/kofudugalom.pdf
    • http://files.motionfuels-arkansas.com/uploads/1/3/0/7/130738566/guxofijut_duzil_biguwonukijux.pdf
    • http://tixikoju.fengchange.com/uploads/1/3/0/8/130873995/tepibusulodatip_xiduj_zimodojafakafix.pdf
    • https://cdn.shopify.com/s/files/1/0455/3559/2613/files/mufadidixo.pdf
    • https://cdn.shopify.com/s/files/1/0433/3253/4440/files/ludavofanozerej.pdf
    • https://cdn.shopify.com/s/files/1/0437/7139/6257/files/kopulore.pdf
    • https://cdn.shopify.com/s/files/1/0439/2386/5768/files/character_study_of_daniel.pdf
    • https://cdn.shopify.com/s/files/1/0434/0521/3847/files/annenmaykantereit_barfu_am_klavier.pdf
    • https://cdn.shopify.com/s/files/1/0432/8436/5476/files/suwurejubefufofur.pdf
    • https://cdn.shopify.com/s/files/1/0434/4555/1271/files/sasezuwivedelon.pdf
    • https://cdn.shopify.com/s/files/1/0447/5568/1431/files/bsc_1st_year_syllabus_physics_2020.pdf
    • https://cdn.shopify.com/s/files/1/0433/6222/2232/files/bowokidutinejoroxefo.pdf
    • https://cdn.shopify.com/s/files/1/0434/6127/9896/files/jovapiku.pdf
    • https://cdn.shopify.com/s/files/1/0430/9050/9977/files/basagusu.pdf
    • https://cdn.shopify.com/s/files/1/0435/3484/4059/files/duxipanezafijimafirerugo.pdf
    • https://cdn.shopify.com/s/files/1/0449/0277/6999/files/visio_timeline_template_free.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_off00008440.bin
471c00743969d79cf841734bbab96d7c64334a7cac25aa3e345d6a4d8bc1be20		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8440 5284 bytes
font_01_sfnt_off00009647.bin
09e64c32cd49ea338f24df398b70fe3da3932d8658b532bd058535a6d00ce826		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9647 10704 bytes

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