Malicious PDF — malware analysis report

Static analysis result for SHA-256 660828b357ba34ed…

MALICIOUS

PDF

77.6 KB Created: 2020-08-09 21:00:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 07ea6ab9123449ae8553cc9aed40935d SHA-1: cb938e90142e1f3f1a684cea371d453317cb5a53 SHA-256: 660828b357ba34ed0e7dc62d893eebe6450806f81e1faa7d768f7a943ba52375
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, identified as a link farm, designed to redirect users to malicious infrastructure. One such link points to 'ttraff.ru', which is flagged as a malicious redirector. The document body, though heavily obfuscated, contains text related to a medical condition and the URL, suggesting a lure to trick users into clicking the malicious links.

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=penfigoide+ampolloso+tratamiento+pdf
    • http://files.studioaase.ca/uploads/1/3/1/4/131407530/fumuge.pdf
    • http://files.caloushop.com/uploads/1/3/1/0/131071137/pimagiw.pdf
    • http://files.thefamilyfunband.com/uploads/1/3/0/7/130739452/tumamoxelas.pdf
    • http://files.petridish-science.org/uploads/1/3/1/6/131607404/dazikukemekim.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/0428/7383/files/39584637953.pdf
    • https://cdn.shopify.com/s/files/1/0436/1617/4237/files/nivuzadawidub.pdf
    • https://cdn.shopify.com/s/files/1/0434/0878/5562/files/roxuno.pdf
    • https://cdn.shopify.com/s/files/1/0433/0664/7717/files/19846259816.pdf
    • https://cdn.shopify.com/s/files/1/0432/6785/0390/files/4890572543.pdf
    • https://cdn.shopify.com/s/files/1/0429/2021/4681/files/depopadufu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/35035436777.pdf
    • https://cdn.shopify.com/s/files/1/0434/7202/7814/files/food_club_neopets.pdf
    • https://cdn.shopify.com/s/files/1/0433/5586/5242/files/4162044296.pdf
    • https://cdn.shopify.com/s/files/1/0432/3095/3630/files/vesepe.pdf
    • https://cdn.shopify.com/s/files/1/0431/3242/0250/files/botitajuk.pdf
    • https://cdn.shopify.com/s/files/1/0430/8788/8551/files/89579828968.pdf
    • https://cdn.shopify.com/s/files/1/0436/2970/7422/files/lufewugafulegetenikesedu.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_off0000eebd.bin
1508be5cebaef4e74f433a73aeee0d9ab7765196dfa04a6fb41b41f81216c36a
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBD 5360 bytes
font_01_sfnt_off000100e9.bin
e903bfdaef4a13df8188928eeeb922773e47b648e591ca186b091e60f2a21993
pdf-font-stream PDF embedded font (sfnt) at offset 0x100E9 11816 bytes