Malicious PDF — malware analysis report

Static analysis result for SHA-256 c95a570a9de84f3c…

MALICIOUS

PDF

48.4 KB Created: 2020-09-02 15:03:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0da333db700e2936cee4aae72b8afb53 SHA-1: 56c039a3e40ff005bed3e3dbd9e44eac321e5bf1 SHA-256: c95a570a9de84f3c9a5f4a616990a9cce6f3782d765785b2c152fcbbe0b29a7e
152 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, which points to 'https://ttraff.cc/wix?keyword=dauntless+hammer+guide+2019'. The document body also contains this URL and numerous other links to PDFs hosted on Shopify, suggesting a link farm or SEO poisoning attempt. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be luring the user to a malicious site via a deceptive document.

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/wix?keyword=dauntless+hammer+guide+2019
    • https://cdn.shopify.com/s/files/1/0428/4946/8582/files/95867387029.pdf
    • https://cdn.shopify.com/s/files/1/0431/6335/3244/files/division_algorithm_proof.pdf
    • https://cdn.shopify.com/s/files/1/0434/5462/7993/files/how_to_develop_confidence_in_public_speaking.pdf
    • https://cdn.shopify.com/s/files/1/0433/3201/0152/files/taxonomia_y_clasificacion_de_los_seres_vivos.pdf
    • https://cdn.shopify.com/s/files/1/0436/5864/1561/files/firefox_portable_version_35.pdf
    • https://static.usrfiles.com/ugd/ac51ce_677d2ed80aa94aa88574233281f685a9.pdf
    • https://static.usrfiles.com/ugd/51c472_772df3b845564790a753896b833a7176.pdf
    • https://static.usrfiles.com/ugd/b8c837_db5137a3c7904d6e862e689d545f7115.pdf
    • https://static.usrfiles.com/ugd/73c254_950663b28d1341288f391e70ff1493ab.pdf
    • https://static.usrfiles.com/ugd/5ecadc_733344c7adbc4c6080151e5417ac20e0.pdf
    • https://static.usrfiles.com/ugd/b8c837_ffa8688089a64fd181585a1459adc7e0.pdf
    • https://static.usrfiles.com/ugd/e4d7df_44cdfe3043ec45488e5fc186e547f45d.pdf
    • https://cdn.shopify.com/s/files/1/0433/3584/3994/files/boviw.pdf
    • https://cdn.shopify.com/s/files/1/0435/7367/4142/files/strength_training_workouts.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_off000068e9.bin
f25056878dfb8ca582f3f4ea1cf61a35e103cc7902d8ad70a0c5cb45c4cdf900		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68E9 5720 bytes
font_01_sfnt_off00007c38.bin
005e60892b700af302f6bb00e2b6ba6152016165ecd5aa631c596a5e27bfc32e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C38 10340 bytes
font_02_sfnt_off00009fd2.bin
d78d7cc1a68daa951b4fbccbcfb906d5a08ad384f187125596154666a45abe72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9FD2 16060 bytes

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