Malicious PDF — malware analysis report

Static analysis result for SHA-256 163edc6765bad037…

MALICIOUS

PDF

45.5 KB Created: 2020-07-30 16:48:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 58d6daefb360a85986b843a50513e964 SHA-1: 20b3dd261cb4ab240bf84fadf83471090ce12bcf SHA-256: 163edc6765bad03799c878be6dab014a02660ce58a0ef6ca6e22c5d9aff6784f
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external PDF files, suggesting a link farm or SEO spam operation. One of the primary links redirects to a known malicious domain, indicating a phishing or malware distribution attempt. The ML classifier also 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.ru/pify?keyword=free+motorcycle+frame+jig+plans+pdf
    • http://files.sabrinaievans.com/uploads/1/3/1/4/131437246/gegoxixa.pdf
    • http://files.annkellettghostwriting.com/uploads/1/3/1/1/131163643/e840ad5a0bf396.pdf
    • http://files.amydethick.com.au/uploads/1/3/0/7/130775260/9a654869700c92.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/2153/1293/files/25205267132.pdf
    • https://cdn.shopify.com/s/files/1/0428/5769/3347/files/linapiwiwolodizuwesaxozuk.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/98629167596.pdf
    • https://cdn.shopify.com/s/files/1/0431/2832/4257/files/18773445783.pdf
    • https://cdn.shopify.com/s/files/1/0432/5805/2763/files/63029436989.pdf
    • https://cdn.shopify.com/s/files/1/0431/1996/8417/files/43106291823.pdf
    • https://cdn.shopify.com/s/files/1/0428/6844/1254/files/68237109335.pdf
    • https://cdn.shopify.com/s/files/1/0429/0324/0871/files/90173221073.pdf
    • https://cdn.shopify.com/s/files/1/0437/3191/0821/files/86005380241.pdf
    • https://cdn.shopify.com/s/files/1/0433/0107/7142/files/zomemekuropisa.pdf
    • https://cdn.shopify.com/s/files/1/0427/5827/5238/files/xagamefavuvinifumatakidup.pdf
    • https://cdn.shopify.com/s/files/1/0429/1300/5724/files/pofozatisilakapifaxukizu.pdf
    • https://cdn.shopify.com/s/files/1/0434/1969/7310/files/wosaxude.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_off00007381.bin
a7c7a4d3a3af9dbb3beddb74d8fe959cd1f702d2b13f66f40036d17965bc28d8
pdf-font-stream PDF embedded font (sfnt) at offset 0x7381 5396 bytes
font_01_sfnt_off000085d2.bin
19ceeb4d4220a9ba81128c824aca3f0f092bd7a7e6600ce0e48a7bdc004e965d
pdf-font-stream PDF embedded font (sfnt) at offset 0x85D2 10328 bytes