Malicious PDF — malware analysis report

Static analysis result for SHA-256 9477a5e882b50356…

MALICIOUS

PDF

54.4 KB Created: 2020-08-13 23:36:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a92eb7289f39ba35930594ad2c002d53 SHA-1: 4d1d0d4e6b6430a61ca97e82b225de3856b682e7 SHA-256: 9477a5e882b50356722e80714e7b2340620652fe87ca4ab01156f853f6876f8e
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm for SEO manipulation. One prominent link, 'https://ttraff.cc/pify?keyword=bodyweight+crossfit+workout+pdf', is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to workout PDFs and the malicious redirector URL, indicating a lure to trick users into clicking the malicious link. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/pify?keyword=bodyweight+crossfit+workout+pdf
    • http://files.prima-ef.org/uploads/1/3/0/7/130739945/5868d927.pdf
    • http://zexadon.10regiment.com/uploads/1/3/1/0/131070306/baca0bba07.pdf
    • http://files.utahenglishcreamgoldenretrievers.com/uploads/1/3/0/8/130874639/jojazigenopap.pdf
    • https://cdn.shopify.com/s/files/1/0432/6686/7362/files/baka_tsuki_to_aru_majutsu_no_index_new_testament.pdf
    • https://cdn.shopify.com/s/files/1/0429/1428/3686/files/riesgo_financiero_libro.pdf
    • https://cdn.shopify.com/s/files/1/0433/9249/9868/files/gukibumirugijiz.pdf
    • https://cdn.shopify.com/s/files/1/0437/3485/9941/files/92042440946.pdf
    • https://cdn.shopify.com/s/files/1/0428/6955/5356/files/chemistry_a_molecular_approach_third_edition.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nemevisofopanufu.pdf
    • https://cdn.shopify.com/s/files/1/0436/7430/4662/files/tagosapix.pdf
    • https://cdn.shopify.com/s/files/1/0429/1543/0559/files/runusuxozajuzunuzibug.pdf
    • https://cdn.shopify.com/s/files/1/0432/9350/7739/files/17160796939.pdf
    • https://cdn.shopify.com/s/files/1/0437/7473/8586/files/55953907628.pdf
    • https://cdn.shopify.com/s/files/1/0435/4683/7151/files/calculus_derivatives_rules.pdf
    • https://cdn.shopify.com/s/files/1/0440/2230/0822/files/github_username_ideas.pdf
    • https://cdn.shopify.com/s/files/1/0428/8462/8633/files/49427884419.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_off000081cb.bin
8f852be2351cececa0d6002a0a30b6576780d2fe56b77f8c34fb0c44ee05236d
pdf-font-stream PDF embedded font (sfnt) at offset 0x81CB 5480 bytes
font_01_sfnt_off00009498.bin
ba8cf781ad9bd9de265b03654dfb1195ae99b90867260b9a68e833bdc80ada6c
pdf-font-stream PDF embedded font (sfnt) at offset 0x9498 10288 bytes
font_02_sfnt_off0000b7bd.bin
6049f7be1eb58524b2bfe5e0ab34f4300347f26dbb23ab6ad605e3b0d5647553
pdf-font-stream PDF embedded font (sfnt) at offset 0xB7BD 16084 bytes