Malicious PDF — malware analysis report

Static analysis result for SHA-256 91e1e3191cca0f5e…

MALICIOUS

PDF

69.0 KB Created: 2020-08-31 03:05:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 106f212ab4731945d7f3e988ef7649c6 SHA-1: e5ee65baba1ce5753d647a962fad899c9407490c SHA-256: 91e1e3191cca0f5e491d2328da17904b10964c3e9460eae51af9f1af9933443f
152 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, containing numerous embedded URLs. One prominent URL, https://ttraff.ru/wix?keyword=pulsating+stars+stellaris, is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document's content appears to be obfuscated or corrupted, but the presence of a malicious redirector URL suggests the primary intent is to lure users to harmful external sites.

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/wix?keyword=pulsating+stars+stellaris
    • https://cdn.shopify.com/s/files/1/0429/3358/4028/files/5350594465.pdf
    • https://cdn.shopify.com/s/files/1/0431/2052/5461/files/basic_mathematics_for_astronomy.pdf
    • https://cdn.shopify.com/s/files/1/0430/1085/0979/files/79914056199.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/90379225571.pdf
    • https://cdn.shopify.com/s/files/1/0433/5792/9621/files/tazevilukoluj.pdf
    • https://cdn.shopify.com/s/files/1/0431/4356/1376/files/34367457574.pdf
    • https://cdn.shopify.com/s/files/1/0428/2816/9375/files/absurdism_theatre.pdf
    • https://static.usrfiles.com/ugd/88a84f_9510a8c2afd7491492c0bbeab134c133.pdf
    • https://static.usrfiles.com/ugd/b8c837_6d1f8fe4a33d46089843b871d05a5bbf.pdf
    • https://static.usrfiles.com/ugd/7f46b5_8c76d12f8d3846df8d6d36588f951c88.pdf
    • https://static.usrfiles.com/ugd/b5472a_b1186df57a2e4c1d8ad27a1eae033ea7.pdf
    • https://static.usrfiles.com/ugd/b8c837_0386f3b8c84d4403ae92a649a43a33dc.pdf
    • https://static.usrfiles.com/ugd/b11f6d_4fe198b7890f44fdbcbd215a19356de8.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_off0000d22e.bin
1af81ae5336c1c546cf5138274930e5d7b8edacfbeabdd5cd17ae28585bfa5bd
pdf-font-stream PDF embedded font (sfnt) at offset 0xD22E 4852 bytes
font_01_sfnt_off0000e2b3.bin
afab2b606667842e87e21f55565cc797de2cd11eaf211dce44300fdecc7cd987
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B3 10632 bytes