Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1c441d478decec0…

MALICIOUS

PDF

43.2 KB Created: 2020-08-18 23:28:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d588c9f2951acd4bccdaea9ce2622a37 SHA-1: fd360de6d02a55c706fcf72137d6d054b0c98142 SHA-256: a1c441d478decec0725ad7325f56d118271268486285c031fc98580450958410
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=wood+platform+bed+ikea', which is flagged as malicious. The presence of a large link farm, including benign-looking Shopify links alongside the malicious redirector, suggests a tactic to obscure malicious intent and potentially leverage search engine optimization for distribution. The ML classifier also strongly indicated maliciousness.

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/pify?keyword=wood+platform+bed+ikea
    • http://papiban.stmaryselmbridge.org/uploads/1/3/2/8/132814930/ffa13a2b79fe.pdf
    • http://files.snelsonsltd.co.uk/uploads/1/3/2/6/132695698/rajuxizedip-dafirukexa-jesav-noderot.pdf
    • http://files.hereverydayrentalservice.ca/uploads/1/3/0/8/130813841/luluxalosaregaf_kodix_kipaworutefux.pdf
    • http://files.remembermequiltguildbr.com/uploads/1/3/0/7/130775102/ecdba70.pdf
    • http://files.randallumc.org/uploads/1/3/1/3/131379820/retojid_nomod_tojupe_kojoseworenid.pdf
    • https://cdn.shopify.com/s/files/1/0443/9041/6550/files/anatomy_of_heart_mcq.pdf
    • https://cdn.shopify.com/s/files/1/0431/9710/4288/files/77949774183.pdf
    • https://cdn.shopify.com/s/files/1/0434/5679/0695/files/macmillan_mathematics_3a.pdf
    • https://cdn.shopify.com/s/files/1/0435/6934/8763/files/687867825.pdf
    • https://cdn.shopify.com/s/files/1/0431/8828/9694/files/4659790584.pdf
    • https://cdn.shopify.com/s/files/1/0431/3127/3365/files/2321010807.pdf
    • https://cdn.shopify.com/s/files/1/0449/3587/2667/files/beaglebone_black_schematic_rev_c.pdf
    • https://cdn.shopify.com/s/files/1/0440/9150/6840/files/jiroditirodubi.pdf
    • https://cdn.shopify.com/s/files/1/0428/0185/6679/files/vixob.pdf
    • https://cdn.shopify.com/s/files/1/0432/1725/6603/files/torevipifumanifasoza.pdf
    • https://cdn.shopify.com/s/files/1/0432/1371/7662/files/vebovej.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_off00006adb.bin
c6a9990f2d4ce8df1a1be68aac742aade11ae1af1a037b2ad74e8add3d32bdd2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6ADB 5224 bytes
font_01_sfnt_off00007c9d.bin
aec31db46d05268f679398856b042730fde7ee7784d4b852b4a334f0928aacb3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C9D 10496 bytes

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