Malicious PDF — malware analysis report

Static analysis result for SHA-256 a589daba14f6bf64…

MALICIOUS

PDF

42.3 KB Created: 2020-08-21 01:45:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e32fc778b782e3d43b0fcb769fb0e409 SHA-1: 88a86dea17eeb39223a0f670c97510d8516b08fb SHA-256: a589daba14f6bf64d279cc0d4f6044678c3c8ddbb02e046865ae833ab911f4b0
154 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with a critical heuristic firing indicating a malicious redirector link. The primary malicious URL identified is 'https://ttraff.ru/pify?keyword=da+m%25C3%25BAsica+aleluia+em+ingl%25C3%25AAs'. The document body itself appears to be malformed or heavily obfuscated, but the presence of the malicious redirector and the link farm structure strongly suggest a phishing or malware distribution attempt.

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=da+m%25C3%25BAsica+aleluia+em+ingl%25C3%25AAs
    • http://files.passionatelycreative.com/uploads/1/3/1/4/131437117/pijigixilakutoturo.pdf
    • http://files.ferryport.org/uploads/1/3/0/9/130969386/figusidijemikifesi.pdf
    • http://files.mancostrails.org/uploads/1/3/0/7/130739831/7084378.pdf
    • https://cdn.shopify.com/s/files/1/0438/3526/1085/files/subreddit_list_5000.pdf
    • https://cdn.shopify.com/s/files/1/0434/7471/4790/files/wefesiv.pdf
    • https://cdn.shopify.com/s/files/1/0430/3775/3501/files/dukijepasoxefud.pdf
    • https://cdn.shopify.com/s/files/1/0429/8250/6647/files/zikixexulukitakada.pdf
    • https://cdn.shopify.com/s/files/1/0428/7194/7423/files/zaladatenelidopewud.pdf
    • https://cdn.shopify.com/s/files/1/0432/7053/7374/files/1248244628.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fapodepemiretewuroraga.pdf
    • https://cdn.shopify.com/s/files/1/0449/9701/7768/files/javascript_save_file_to_disk.pdf
    • https://cdn.shopify.com/s/files/1/0430/7845/1349/files/new_hire_onboarding_process_template.pdf
    • https://cdn.shopify.com/s/files/1/0434/7399/3890/files/37254979989.pdf
    • https://cdn.shopify.com/s/files/1/0433/5327/6574/files/american_history_textbook_11th_grade.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_off00006450.bin
6b6d8d73c78f627bf65add29e86e45d99da765cf88dd79ba5a8c13eda7001783
pdf-font-stream PDF embedded font (sfnt) at offset 0x6450 5288 bytes
font_01_sfnt_off000075ca.bin
4562b67032f9a6d60dbde0ccb402044ae0bf5a4c9ada9ead3464edec4bae955d
pdf-font-stream PDF embedded font (sfnt) at offset 0x75CA 12004 bytes