Malicious PDF — malware analysis report

Static analysis result for SHA-256 e13c8b0be4b3f368…

MALICIOUS

PDF

45.0 KB Created: 2020-08-08 23:54:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f83c0ef8ac4a0303d439449ed4947834 SHA-1: 13d3174e01f988ac7206ab787788c98db94b9406 SHA-256: e13c8b0be4b3f3685a15fcb5a4057f91f212b9d1e7edc361b43dcb3ccc0a789e
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=inhalation+de+liquide+amniotique+pdf'. This indicates the document's primary purpose is to lure the user to a potentially harmful external site. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the embedded URL is sufficient evidence for the attack pattern.

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=inhalation+de+liquide+amniotique+pdf
    • http://files.drewshanefield.com/uploads/1/3/1/3/131382955/583021c.pdf
    • http://files.sueannecelebrant.com/uploads/1/3/1/4/131437351/26ff42c.pdf
    • http://files.artbydodie.com/uploads/1/3/1/8/131872149/gosivivebarixagoj.pdf
    • https://cdn.shopify.com/s/files/1/0435/4346/2037/files/george_bridgman_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0428/9993/1295/files/tipenesupibuf.pdf
    • https://cdn.shopify.com/s/files/1/0452/4684/0994/files/esterification_of_carboxylic_acid.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/42778697636.pdf
    • https://cdn.shopify.com/s/files/1/0432/6912/8354/files/43734213265.pdf
    • https://cdn.shopify.com/s/files/1/0427/5752/1574/files/87876879130.pdf
    • https://cdn.shopify.com/s/files/1/0447/5823/7333/files/10x20_shed_plans.pdf
    • https://cdn.shopify.com/s/files/1/0432/1466/7934/files/gilevivozo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/memew.pdf
    • https://cdn.shopify.com/s/files/1/0432/1270/1854/files/dupetirarajaxegunejikiro.pdf
    • https://cdn.shopify.com/s/files/1/0440/3098/4357/files/jerazubukebakumazosu.pdf
    • https://cdn.shopify.com/s/files/1/0438/1694/3778/files/23514922112.pdf
    • https://cdn.shopify.com/s/files/1/0430/6753/9623/files/88694658711.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_off00006ea2.bin
f963b3950802220919161cfa1a9c2d3ca2df7717638de0f2688417acc2b575bc
pdf-font-stream PDF embedded font (sfnt) at offset 0x6EA2 5072 bytes
font_01_sfnt_off00007fbd.bin
4c3c536bc51c49306622674fa0601322ae9f2bc8d30ce053b481474bd7a0ae8a
pdf-font-stream PDF embedded font (sfnt) at offset 0x7FBD 11736 bytes