Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b4bf51d832b637a…

MALICIOUS

PDF

44.4 KB Created: 2020-08-20 22:57:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5c28f8050d2b8fdc18b5580c23d97f4b SHA-1: 0274e63553bf8ec7ff0697b494932f01506b7878 SHA-256: 5b4bf51d832b637a81912f371951d3ea6d4e21ea6d32e332a2a9d106a337cdbe
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains the malicious URL and other benign-looking PDF filenames, suggesting a link farm or SEO poisoning attempt to lure users to malicious content. No scripts were extracted, but the presence of malicious links is the primary indicator of compromise.

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.ru/pify?keyword=ffxiv+fashion+report+points
    • http://files.glwdelivery.com/uploads/1/3/0/7/130739126/xebap.pdf
    • http://gazulu.carolynwagnerdesign.com/uploads/1/3/0/7/130740019/wirigokug_samewenaxewag_keluvibowisula.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/4215/9257/files/bordereau_cnss.pdf
    • https://cdn.shopify.com/s/files/1/0430/6878/4791/files/geometrical_isomerism_download.pdf
    • https://cdn.shopify.com/s/files/1/0427/7207/0556/files/best_new_android_apps_2019.pdf
    • https://cdn.shopify.com/s/files/1/0445/3544/7711/files/aromaticity_lecture_notes.pdf
    • https://cdn.shopify.com/s/files/1/0437/8850/1143/files/employee_self_evaluation_sample_answers_customer_focus.pdf
    • https://cdn.shopify.com/s/files/1/0430/6249/3345/files/gipipuduruwawutireg.pdf
    • https://cdn.shopify.com/s/files/1/0431/4405/2898/files/78880650097.pdf
    • https://cdn.shopify.com/s/files/1/0431/4018/6279/files/alsthom_atlantique_transformateur.pdf
    • https://cdn.shopify.com/s/files/1/0438/0937/4365/files/tijusagurexutig.pdf
    • https://cdn.shopify.com/s/files/1/0434/2949/4936/files/jonizonedabutosufuxa.pdf
    • https://cdn.shopify.com/s/files/1/0436/2112/2208/files/pixaforobuvisirojipo.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007148.bin
e7ded9519983b2f09156508cf7b6fff4ee6664997ee632f3673432f1bba8eacd
pdf-font-stream PDF embedded font (sfnt) at offset 0x7148 5040 bytes
font_01_sfnt_off00008272.bin
ba6ae8413d441590c1b33b35a614e35dfff0cab619b654f143da4cc997a92983
pdf-font-stream PDF embedded font (sfnt) at offset 0x8272 10192 bytes