Malicious PDF — malware analysis report

Static analysis result for SHA-256 a02342064dbf322b…

MALICIOUS

PDF

44.7 KB Created: 2020-08-09 16:08:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d108ade7f019536d6084ec6f883229d3 SHA-1: 9885c29e77603e1f8a2a50e8cac6134cbef36b02 SHA-256: a02342064dbf322b467c722d5db008eff6302eba3744ec5ab585e3111e3f3a8b
152 Risk Score

Malware Insights

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

The PDF file was identified as malicious due to the presence of numerous embedded links, including one pointing to a known malicious redirector at 'ttraff.com'. The document body, though heavily obfuscated, contains references to HTML tags and PDF, suggesting a lure related to web content or document manipulation. The ML classifier strongly indicated maliciousness, supporting the heuristic findings.

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=html+tags+pdf
    • http://files.mobileautorepairsolutions.com/uploads/1/3/2/7/132710621/87e8c774e.pdf
    • http://files.drinkyourcarbs.com/uploads/1/3/1/1/131164252/gitavuxen-volumewuzu-dazuxomu.pdf
    • http://kazopu.silentnomore.org/uploads/1/3/1/4/131483281/9774745.pdf
    • http://files.spaceairforce.us/uploads/1/3/2/8/132815123/294490.pdf
    • https://cdn.shopify.com/s/files/1/0431/5847/0816/files/17412489669.pdf
    • https://cdn.shopify.com/s/files/1/0438/5131/7408/files/dujag.pdf
    • https://cdn.shopify.com/s/files/1/0435/6512/1699/files/7._3_idi_specs.pdf
    • https://cdn.shopify.com/s/files/1/0427/9291/1007/files/75999563082.pdf
    • https://cdn.shopify.com/s/files/1/0428/5435/1015/files/79458017901.pdf
    • https://cdn.shopify.com/s/files/1/0431/4995/1125/files/pushing_code_to_github.pdf
    • https://cdn.shopify.com/s/files/1/0429/9482/7418/files/75329685858.pdf
    • https://cdn.shopify.com/s/files/1/0435/5381/6728/files/alliteration_examples.pdf
    • https://cdn.shopify.com/s/files/1/0428/3976/9254/files/tears_for_fears_discography.pdf
    • https://cdn.shopify.com/s/files/1/0429/0582/9532/files/39855957315.pdf
    • https://cdn.shopify.com/s/files/1/0429/5986/3959/files/79132577886.pdf
    • https://cdn.shopify.com/s/files/1/0430/6105/1546/files/allen_bradley_powerflex_4_manual.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_off000068ac.bin
ca3488730f695a77f9df1919796c363086547b66489b9f6fe10ee20ebe725286
pdf-font-stream PDF embedded font (sfnt) at offset 0x68AC 5228 bytes
font_01_sfnt_off00007a67.bin
b0c6d6f23d737da7d38004b3521497a1702366ff1f5431d52f9531ff1b8f58ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A67 13604 bytes