Malicious PDF — malware analysis report

Static analysis result for SHA-256 8df37a7eb343f07a…

MALICIOUS

PDF

50.4 KB Created: 2020-08-16 21:04:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef6e242015af58b3371395eda4ff2968 SHA-1: 5b67e0eb800f4f0fa877744782e84b78c2c488c3 SHA-256: 8df37a7eb343f07acbfd9717ed25545f53da55373524a3a6c08daa0adc5044e0
152 Risk Score

Malware Insights

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

The PDF contains a prominent link with the text 'Pwc situational judgement test answers', which redirects to a malicious URL. This indicates a social engineering attack aimed at tricking users into visiting a harmful site. The PDF also hosts a large number of external links, many pointing to Shopify, suggesting a link farm or redirection strategy. The ML classifier strongly flagged this PDF as malicious.

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.cc/pify?keyword=pwc+situational+judgement+test+answers
    • http://files.enchantedfloralsofelkhartlake.com/uploads/1/3/1/4/131454270/2becbe23.pdf
    • https://cdn.shopify.com/s/files/1/0437/6716/9173/files/vemuro.pdf
    • https://cdn.shopify.com/s/files/1/0438/0481/9613/files/oracle_12c_sql_fundamentals.pdf
    • https://cdn.shopify.com/s/files/1/0432/4841/8973/files/esclerosis_multiple_tipos.pdf
    • https://cdn.shopify.com/s/files/1/0438/8998/3640/files/63998749990.pdf
    • https://cdn.shopify.com/s/files/1/0431/5545/6149/files/gugafo.pdf
    • https://cdn.shopify.com/s/files/1/0430/6187/0741/files/zepipepirakeriborisag.pdf
    • https://cdn.shopify.com/s/files/1/0430/6891/5863/files/pajilevoduduwedenidata.pdf
    • https://cdn.shopify.com/s/files/1/0437/1978/6645/files/30253144537.pdf
    • https://cdn.shopify.com/s/files/1/0439/4654/1211/files/callan_method_book_5_free_download.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007770.bin
9e8d7d35152b367f9232f6ee9ee19d993d082f6d355ac9c1568b4122397f83fa
pdf-font-stream PDF embedded font (sfnt) at offset 0x7770 5308 bytes
font_01_sfnt_off0000896b.bin
08d7df4610f6fe039b4fb4563af507967194d3cf6cbb6c306f42b8c874621128
pdf-font-stream PDF embedded font (sfnt) at offset 0x896B 11480 bytes
font_02_sfnt_off0000aed0.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
pdf-font-stream PDF embedded font (sfnt) at offset 0xAED0 4324 bytes