Malicious PDF — malware analysis report

Static analysis result for SHA-256 bed42aa34fc8d313…

MALICIOUS

PDF

54.2 KB Created: 2020-08-25 15:17:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e9ded0a220b44606c5d1b5bfcb929d9 SHA-1: 84857cbe007ddee99c709efbad3438e6e66d9d22 SHA-256: bed42aa34fc8d313cfe35bd38f583433856bab7cfc75ab9272d4663f2dad53c9
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/pify?keyword=ielts+vocabulary+pdf+2018', suggesting a lure to a phishing or malware distribution site. 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.com/pify?keyword=ielts+vocabulary+pdf+2018
    • http://files.kavkid.com/uploads/1/3/0/8/130874627/289422.pdf
    • http://fekejow.fortis-fp.com/uploads/1/3/1/3/131380600/2624098.pdf
    • http://files.citysidelocksmith.com/uploads/1/3/2/7/132740181/aa0ddfeb6b2d1.pdf
    • https://cdn.shopify.com/s/files/1/0432/9888/1704/files/19087555591.pdf
    • https://cdn.shopify.com/s/files/1/0433/4052/9816/files/polabosixoni.pdf
    • https://cdn.shopify.com/s/files/1/0431/9353/2573/files/91602082461.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tevegijetowid.pdf
    • https://cdn.shopify.com/s/files/1/0438/3778/4229/files/21058371639.pdf
    • https://cdn.shopify.com/s/files/1/0430/3860/5461/files/41291440753.pdf
    • https://cdn.shopify.com/s/files/1/0433/5101/5577/files/61666337454.pdf
    • https://cdn.shopify.com/s/files/1/0430/0662/3903/files/tufabumemos.pdf
    • https://cdn.shopify.com/s/files/1/0447/8923/5861/files/what_is_microsoft_mobile_plans.pdf
    • https://cdn.shopify.com/s/files/1/0437/4642/7031/files/letter_m_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0432/1493/0084/files/sonny_ericson_w580i.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000075bf.bin
a2240695b48883965fbe9579bd4b002c0f6cb4de511fe3f5220776a90adc55a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75BF 5908 bytes
font_01_sfnt_off000089f0.bin
1f756b46481ac718095810e133e155ec1caf818687d25c20e8b002f727d713c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89F0 2116 bytes
font_02_sfnt_off0000939c.bin
8253aef12ed8267ce0bcfcd63fa980ac4bcbce06981842cd338e66f158ac88ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x939C 10076 bytes
font_03_sfnt_off0000b626.bin
5338b60dac2ddcc9fbf81734882903060897ff8c18563aad6864a581beec55c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB626 16068 bytes

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