Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c1a1cc1c6b167d3…

MALICIOUS

PDF

60.3 KB Created: 2020-09-17 00:09:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b1c60abac4adc04661ff957d93d5927 SHA-1: d61830cb04447720ca620c461de139aaf16c2c35 SHA-256: 4c1a1cc1c6b167d3d3867f006610946ed2a06bc1fec62b224507854e1bc4facb
152 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics indicating malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The primary malicious IOC is the redirector URL, which is likely part of a phishing or malware distribution chain. The document body itself is heavily obfuscated and appears to be generated content rather than user-readable text, but it does contain embedded URLs.

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.link/wix?keyword=%25D8%25A7%25D8%25AD%25D8%25A8%25D9%2583+%25D9%2584%25D9%2588+%25D8%25AA%25D9%2583%25D9%2588%25D9%2586+%25D8%25AD%25D8%25A7%25D8%25B6%25D8%25B1
    • http://geweza.freddiequartley.com/uploads/1/3/1/0/131070306/4656935.pdf
    • https://e5684375-a05d-4a70-b514-d61b896756cd.filesusr.com/ugd/ea2c45_2ec3fe2e503143d193d41e9e8e3e7e68.pdf?index=true
    • https://2769c9a5-1917-42e7-a111-d2b360526812.filesusr.com/ugd/33ab24_f3b2cab6ebaf4fc1a3743a4d9a6fda1c.pdf?index=true
    • https://442c9c66-343c-400d-ac9d-5591aa908b32.filesusr.com/ugd/405339_575e4220d3e641fca16ddf3e259a2412.pdf?index=true
    • https://c6570259-b0d9-4573-b713-829de680a733.filesusr.com/ugd/a6e5e9_c33b2265e70941b68b804e15511d9746.pdf?index=true
    • https://3f1872d2-712d-4a13-92b6-f49a2ebc3b7e.filesusr.com/ugd/4c1554_c2f5bac4cad4483db3a57f965ee1d705.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0450/5288/7190/files/zelda_botw_shrine_map.pdf
    • https://cdn.shopify.com/s/files/1/0465/3989/9039/files/raging_planet_hurricane_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0428/4763/3575/files/53533919833.pdf
    • https://cdn.shopify.com/s/files/1/0435/7016/7966/files/deluf.pdf
    • https://cdn.shopify.com/s/files/1/0432/9635/8565/files/kijovawakigulo.pdf
    • https://cdn.shopify.com/s/files/1/0432/8036/7780/files/mepufu.pdf
    • https://cdn.shopify.com/s/files/1/0437/3318/8762/files/bhai_cha_birthday_status_audio_song.pdf
    • https://cdn.shopify.com/s/files/1/0429/7916/4314/files/adobe_audition_cs5_5_free_trial.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00009db7.bin
21c36d22df0649e58aa6e8436aec72ad6ce656379b2f4e84321e80b75972b1b3		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x9DB7 30264 bytes
font_00_sfnt_off00005dc9.bin
1293e7781da4521cfbf306b7f519c13d499139c0a95a67c4162b06e46f851423		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DC9 3396 bytes
font_01_sfnt_off000068d0.bin
6e33698a3237dfa057128051db9e1903de9f28bbb3c61d0146d28b3abaa979e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68D0 7864 bytes
font_02_sfnt_off000083d1.bin
dacbe84103e087b8c455e8d60aa96ca8857ca20fa6d90dc3b0bde4cbf60dd834		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83D1 17404 bytes
font_04_sfnt_off0000d350.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD350 4324 bytes

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