Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f88e51b6acc40bd…

MALICIOUS

PDF

47.3 KB Created: 2020-08-30 09:04:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d512df608eb0f169896d8263a0101c9d SHA-1: 0e9180c02ba6993d26fb7be4471f5b0fe876604c SHA-256: 2f88e51b6acc40bd700af21817da6eb0d99e6702d9ee501be4da64ad8bcbee7b
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm, with many embedded links pointing to external resources. This suggests the primary purpose is 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.com/wix?keyword=bitacora+de+soporte+tecnico+excel
    • https://static.usrfiles.com/ugd/0df15e_3ecfacecc9f14d5a815d5f3ae07f4cfe.pdf
    • https://static.usrfiles.com/ugd/865d50_0aac886fc3304f00a64deb8400030915.pdf
    • https://static.usrfiles.com/ugd/575363_4adc3f45c3904d418b09aa969ff7e862.pdf
    • https://static.usrfiles.com/ugd/b8c837_ef64db22aab343f0991277b148a2d49d.pdf
    • https://static.usrfiles.com/ugd/12f4eb_09b3da9683da43c5b077014515bbf9a9.pdf
    • https://cdn.shopify.com/s/files/1/0429/1795/3702/files/koxes.pdf
    • https://cdn.shopify.com/s/files/1/0437/6425/2823/files/representation_theory_book.pdf
    • https://cdn.shopify.com/s/files/1/0440/2947/7014/files/message_notification_sounds_not_working_android.pdf
    • https://cdn.shopify.com/s/files/1/0427/4615/1078/files/59945652894.pdf
    • https://cdn.shopify.com/s/files/1/0437/8486/3893/files/493062730.pdf
    • https://cdn.shopify.com/s/files/1/0429/0609/1687/files/47544546287.pdf
    • https://cdn.shopify.com/s/files/1/0429/3741/7887/files/duratojujeviwuxigoxaro.pdf
    • https://static.usrfiles.com/ugd/37321e_3ae1543f3f0b4689b03980cd46bb5b7e.pdf
    • https://static.usrfiles.com/ugd/9b33c5_d8c5a036b7424429b630f27fca44d47c.pdf
    • https://static.usrfiles.com/ugd/b8c837_d77a21b49db04cce8b30a19cc796e2bc.pdf
    • https://static.usrfiles.com/ugd/b8c837_557249ec494e4881a9f2d85c22145eb4.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_off00006890.bin
76e7969465ec2549cc6b2afee78a616235a76e3a293a48bcedebf4afef518b5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6890 4972 bytes
font_01_sfnt_off00007973.bin
1b0773d69e7bee478ca4cb6fff88f9b912775fd500b8c120d54fa620f82cc9f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7973 12364 bytes
font_02_sfnt_off00009fd4.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9FD4 4324 bytes

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