Malicious PDF — malware analysis report

Static analysis result for SHA-256 c70ccca59f54800b…

MALICIOUS

PDF

44.4 KB Created: 2020-08-18 21:51:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1c94eefa6fdb618dfce1a69e66c63bd SHA-1: 5c3ca7f838ff6843da90c17c9036aee235905bb7 SHA-256: c70ccca59f54800b8a258e357de8d909aed6014ed068758755a40bbd75abd43a
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify, and one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'dysfunctional uterine bleeding pdf' and the malicious URL, suggesting a lure to drive traffic to malicious infrastructure. The ML classifier also strongly indicated maliciousness.

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=dysfunctional+uterine+bleeding+pdf
    • http://files.eastsuperiorcc.com/uploads/1/3/1/0/131070009/buwugedurutusi.pdf
    • http://nixeruj.thehouseug.com/uploads/1/3/1/4/131437044/jorekajunineli-remisupixafuno-tifig.pdf
    • http://files.maggiewatkinsdoula.com/uploads/1/3/0/8/130813991/376082.pdf
    • http://wawexuj.tribalsoundhealing.com/uploads/1/3/2/6/132695578/rajefopafejiju.pdf
    • https://cdn.shopify.com/s/files/1/0434/8153/0534/files/sadut.pdf
    • https://cdn.shopify.com/s/files/1/0432/8819/9328/files/41578719920.pdf
    • https://cdn.shopify.com/s/files/1/0431/6109/2245/files/95751682674.pdf
    • https://cdn.shopify.com/s/files/1/0430/5371/1513/files/materi_olimpiade_biologi_sma.pdf
    • https://cdn.shopify.com/s/files/1/0431/6263/2346/files/todapuzerexi.pdf
    • https://cdn.shopify.com/s/files/1/0432/2800/4507/files/96952480864.pdf
    • https://cdn.shopify.com/s/files/1/0431/7249/5524/files/clinical_pharmacy_and_therapeutics_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/4669/9165/files/rodajijaf.pdf
    • https://cdn.shopify.com/s/files/1/0432/7777/9100/files/beta_binomial_distribution.pdf
    • https://cdn.shopify.com/s/files/1/0437/7876/9045/files/make_friends_and_influence_others.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/44603331863.pdf
    • https://cdn.shopify.com/s/files/1/0430/0151/2090/files/35762278962.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_off0000668f.bin
f7f94422ed83912d6d6c17304e384914b42a1fccb5687f6cb56e8e19f081f368
pdf-font-stream PDF embedded font (sfnt) at offset 0x668F 5564 bytes
font_01_sfnt_off00007984.bin
ff4b9ff4641306630c82a22514465f1b0e9e4985e3b2b5c9030dd293939a39b6
pdf-font-stream PDF embedded font (sfnt) at offset 0x7984 13808 bytes