Malicious PDF — malware analysis report

Static analysis result for SHA-256 40c31fb741320df5…

MALICIOUS

PDF

46.2 KB Created: 2020-08-08 18:43:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10a4cd6e4566d590b356156665e23a56 SHA-1: 88be0e83db4e1f4fc74a69f32ef128e9f80977d5 SHA-256: 40c31fb741320df5d085fc06ef16c3197fce7d4d73e9127a8344db76b5314b29
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with the primary malicious link identified as a redirector. The document body, though partially corrupted, includes the malicious URL and references to other PDFs hosted on Shopify, suggesting a link farm strategy. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is designed to lure users to malicious 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.cc/wb?keyword=mick%20foley%20have%20a%20nice%20day%20pdf
    • http://vawisam.bemispa.com/uploads/1/3/0/7/130776661/jomobova-latutuzafile-fimimitok.pdf
    • http://files.sustainablesubstrates.com/uploads/1/3/1/4/131408024/a59272d44.pdf
    • http://files.tucson3gun.com/uploads/1/3/1/8/131856519/vozat_meminupoduxukav_zuvak.pdf
    • http://files.afdpc.org/uploads/1/3/1/4/131483440/gugog.pdf
    • https://cdn.shopify.com/s/files/1/0446/1376/3235/files/anti_inflammatory_herbs.pdf
    • https://cdn.shopify.com/s/files/1/0430/4932/0610/files/41385801877.pdf
    • https://cdn.shopify.com/s/files/1/0434/2670/9665/files/bolibomutolu.pdf
    • https://cdn.shopify.com/s/files/1/0428/6477/1238/files/sofatalawagamumujux.pdf
    • https://cdn.shopify.com/s/files/1/0429/4675/6774/files/capteur_ultrason_hc_sr04.pdf
    • https://cdn.shopify.com/s/files/1/0433/4488/7963/files/74927473328.pdf
    • https://cdn.shopify.com/s/files/1/0437/2047/4779/files/betacaroteno_beneficios.pdf
    • https://cdn.shopify.com/s/files/1/0434/1583/0695/files/carnatic_flute_tutorials.pdf
    • https://cdn.shopify.com/s/files/1/0432/8026/9462/files/9756118714.pdf
    • https://cdn.shopify.com/s/files/1/0441/3823/4008/files/rewexoxomojeg.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/4107173541.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/30072581460.pdf
    • https://cdn.shopify.com/s/files/1/0431/8353/8331/files/91903287854.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_off00007744.bin
a70b6b1fccb10065c89bd9bf793c998cf4077700d065fcd74f05b49bcffea507
pdf-font-stream PDF embedded font (sfnt) at offset 0x7744 5200 bytes
font_01_sfnt_off0000891b.bin
298c0c2b40f22f4c8dbb222694d93e236db2fc5da1f88edd647ede6d6ad53e77
pdf-font-stream PDF embedded font (sfnt) at offset 0x891B 10176 bytes