Malicious PDF — malware analysis report

Static analysis result for SHA-256 44ae957ef3b7084a…

MALICIOUS

PDF

42.5 KB Created: 2020-08-31 11:59:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db5b1767da7367136917eb1533f4eb7b SHA-1: 840479f1f86a11628a3304d47d7f2b8bd4d1a67b SHA-256: 44ae957ef3b7084a830be2dd76d476e3526efc4cfaf2eda19cbd3335ee095361
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many of which point to Shopify domains hosting other PDF files, suggesting a link farm for SEO manipulation. One prominent link, however, directs to 'ttraff.com', identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'the dragonbone chair pdf free download' and the malicious URL, indicating a lure to trick users into clicking the malicious link. 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/wix?keyword=the+dragonbone+chair+pdf+free+download
    • https://cdn.shopify.com/s/files/1/0429/9912/0033/files/zomuzuxadurom.pdf
    • https://cdn.shopify.com/s/files/1/0433/6926/7354/files/33026077608.pdf
    • https://cdn.shopify.com/s/files/1/0429/9646/5823/files/bivileju.pdf
    • https://cdn.shopify.com/s/files/1/0436/6503/1321/files/ascii_middle_finger_one_line.pdf
    • https://cdn.shopify.com/s/files/1/0434/0934/2621/files/adobe_premiere_pro_cs6_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0430/8949/4177/files/afro_soul_songs_free.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xigidewepiwunabifaw.pdf
    • https://cdn.shopify.com/s/files/1/0438/1507/6002/files/nuzivesek.pdf
    • https://cdn.shopify.com/s/files/1/0432/6418/0390/files/how_to_make_a_favicon.pdf
    • https://cdn.shopify.com/s/files/1/0435/5942/0063/files/spanish_grammar_workbook.pdf
    • https://static.usrfiles.com/ugd/dd4472_763940ed23914b1e99bc35649c16c88e.pdf
    • https://static.usrfiles.com/ugd/e2c6c1_2ef4dc15abe743ab93432eef1c832004.pdf
    • https://static.usrfiles.com/ugd/b8c837_321509018dc64367ae7f55a15431404a.pdf
    • https://static.usrfiles.com/ugd/b8c837_7962e81a674e4c5991407043bf64889c.pdf
    • https://cdn.shopify.com/s/files/1/0431/1603/6257/files/4669977828.pdf
    • https://cdn.shopify.com/s/files/1/0428/8220/3801/files/36856421475.pdf
    • https://cdn.shopify.com/s/files/1/0432/4923/8184/files/povafaninivovubataxu.pdf
    • https://cdn.shopify.com/s/files/1/0436/5503/7093/files/berajaladur.pdf
    • https://cdn.shopify.com/s/files/1/0431/3173/2132/files/devolikaki.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_off000066a9.bin
f02cde4f300c4cc5af5121e61f546e24d2aa97b5e38324e2132c8c1b0961f261		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66A9 5420 bytes
font_01_sfnt_off0000791f.bin
64bce212f47900e8253ce309aca98bca54966e0331d104a0cec2dd48326425a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x791F 10560 bytes

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