Malicious PDF — malware analysis report

Static analysis result for SHA-256 d51d990be47b2c45…

MALICIOUS

PDF

65.6 KB Created: 2020-08-12 19:35:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 29be2707bf0799972f16fb847ccb74d9 SHA-1: f59bb9aea7b403f90b28a5c0a2d0e5fced942295 SHA-256: d51d990be47b2c45c2c22ec6fe36b603c2947306fb41e605af3ecd86b0e8b9d3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.com/pify?keyword=credit+risk+management+process+pdf'. This URL is embedded within the document body, suggesting a social engineering lure disguised as a document about credit risk management. The presence of a large number of external PDF links, many hosted on Shopify, further indicates a link farm designed to distribute malicious content. The ML classifier also strongly flagged this PDF as malicious.

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/pify?keyword=credit+risk+management+process+pdf
    • http://nitupusel.ascensionhousehk.com/uploads/1/3/1/3/131398591/zukujiwivezavasaj.pdf
    • http://xorom.behngiepseng.com/uploads/1/3/1/4/131437792/xazodalikiki.pdf
    • http://files.drnathangrebe.com/uploads/1/3/0/7/130739147/lanakixeferijo.pdf
    • https://cdn.shopify.com/s/files/1/0435/2176/9627/files/48649438451.pdf
    • https://cdn.shopify.com/s/files/1/0433/0173/2520/files/breath_of_the_wild_walkthrough_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/8239/1451/files/gudopumaf.pdf
    • https://cdn.shopify.com/s/files/1/0432/0234/7168/files/jujubuzalabiwu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/61086590007.pdf
    • https://cdn.shopify.com/s/files/1/0429/5272/0543/files/16664771943.pdf
    • https://cdn.shopify.com/s/files/1/0435/1531/4330/files/zutajujomifinelojiv.pdf
    • https://cdn.shopify.com/s/files/1/0432/7437/1235/files/jebiwoluwajatatefaposiku.pdf
    • https://cdn.shopify.com/s/files/1/0437/4007/0042/files/ascii_to_binary_table.pdf
    • https://cdn.shopify.com/s/files/1/0433/0097/8853/files/mirefedevelakuteme.pdf
    • https://cdn.shopify.com/s/files/1/0428/8829/8662/files/nilasujadivomogepupotal.pdf
    • https://cdn.shopify.com/s/files/1/0435/4818/0634/files/o_que_meio_ambiente.pdf
    • https://cdn.shopify.com/s/files/1/0430/7920/5018/files/divebagegi.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_off0000c2aa.bin
aade5bd61873ce7e7a928b3d6eb610c57b9b777c5e6f7812fde4acb921f12f2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC2AA 5412 bytes
font_01_sfnt_off0000d501.bin
48266be85a3e42c7c82fa8f2ac1c9da6144bc6bd24efb453e8f386610df2ce87		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD501 10660 bytes

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