Malicious PDF — malware analysis report

Static analysis result for SHA-256 a22125181d39dede…

MALICIOUS

PDF

51.8 KB Created: 2020-09-05 22:48:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f39a0db22a03f6b5bdfdca73b8f6ab1b SHA-1: 4c08d72222069a56f58d23ff7ae81065b0fc54fd SHA-256: a22125181d39dededb49a4490230a0c30dfcd437b43dbbef64b2304857f1bb01
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.me/wix?keyword=g+n+m+ka+full+form'. Additionally, it exhibits a PDF SEO link farm behavior, embedding numerous links to other PDFs hosted on cdn.shopify.com, with the first identified link being 'https://cdn.shopify.com/s/files/1/0430/8307/1650/files/jinedotugalikomibobapite.pdf'. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but includes the primary malicious URL and several benign-looking PDF links, suggesting a lure to a malicious site.

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.me/wix?keyword=g+n+m+ka+full+form
    • https://cdn.shopify.com/s/files/1/0430/8307/1650/files/jinedotugalikomibobapite.pdf
    • https://cdn.shopify.com/s/files/1/0439/3140/2395/files/92033788314.pdf
    • https://cdn.shopify.com/s/files/1/0440/3943/8486/files/cheppave_chirugali_telugu_audio_songs_free.pdf
    • https://cdn.shopify.com/s/files/1/0436/1990/9794/files/51830002358.pdf
    • https://cdn.shopify.com/s/files/1/0429/9846/4661/files/77218656562.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kemisavixazesunomezixe.pdf
    • https://cdn.shopify.com/s/files/1/0435/6728/4379/files/26414322660.pdf
    • https://cdn.shopify.com/s/files/1/0430/2451/5229/files/63712623241.pdf
    • https://cdn.shopify.com/s/files/1/0433/8984/5654/files/88246279752.pdf
    • https://cdn.shopify.com/s/files/1/0431/4211/9592/files/factors_affecting_media_selection_in_advertising.pdf
    • https://cdn.shopify.com/s/files/1/0432/9222/9787/files/bexanexixirimenetabato.pdf
    • https://cdn.shopify.com/s/files/1/0432/8977/2190/files/.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_off00006fea.bin
4049bb7eafbebd9d458ab280686048a2cfd8481372b0e911f9f6061133a8ab8f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6FEA 4832 bytes
font_01_sfnt_off00008047.bin
922062479410abc5c67859374e421b21e56e14f2d123a6c0a417b7d7167e27c8
pdf-font-stream PDF embedded font (sfnt) at offset 0x8047 15152 bytes
font_02_sfnt_off0000af40.bin
4b2df3fb73489d596ca19cb23231f968493e2d8c1f3867d180eb18dbb7767e01
pdf-font-stream PDF embedded font (sfnt) at offset 0xAF40 5408 bytes