Malicious PDF — malware analysis report

Static analysis result for SHA-256 a50dc4462d636b70…

MALICIOUS

PDF

58.4 KB Created: 2020-08-07 01:23:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c05066bb51be333f5b2fa8424e8c705 SHA-1: 3cada3282ac0351876fdde958576ac8cc24fbc89 SHA-256: a50dc4462d636b701f519674fe4e0c629804691152b1af588eb36d3e9c94d834
154 Risk Score

Malware Insights

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

The PDF document was identified as malicious due to its inclusion of a link farm pointing to a redirector URL, likely intended to lure users into downloading further malicious content. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags the URL https://ttraff.com/pify?keyword=b+ed+books+pdf+files as malicious. The document body, though heavily obfuscated, contains references to this URL and numerous other Shopify-hosted PDF links, suggesting a coordinated effort to distribute malicious content under the guise of educational materials.

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=b+ed+books+pdf+files
    • http://files.weekendinquest.org/uploads/1/3/1/4/131437005/siduzamelofubaf_tiruwedurutu_tadodimomivo_siparexenovewis.pdf
    • http://files.metermixdispense.com/uploads/1/3/1/4/131438038/f8730f32cb63.pdf
    • http://files.thecentennialhotel.com/uploads/1/3/2/6/132682802/kumetim.pdf
    • http://files.islandholisticsllc.com/uploads/1/3/1/4/131410485/purigot.pdf
    • https://cdn.shopify.com/s/files/1/0428/8957/6601/files/48735385103.pdf
    • https://cdn.shopify.com/s/files/1/0428/7257/0012/files/80573943765.pdf
    • https://cdn.shopify.com/s/files/1/0433/9141/8526/files/solutions_to_poverty_in_africa.pdf
    • https://cdn.shopify.com/s/files/1/0438/9902/7611/files/45825024213.pdf
    • https://cdn.shopify.com/s/files/1/0428/4140/7644/files/gloomhaven_solo_items.pdf
    • https://cdn.shopify.com/s/files/1/0433/7061/0851/files/mikadoboga.pdf
    • https://cdn.shopify.com/s/files/1/0433/5144/1560/files/7360904662.pdf
    • https://cdn.shopify.com/s/files/1/0438/5685/5190/files/suvur.pdf
    • https://cdn.shopify.com/s/files/1/0431/7950/7880/files/robemonapebobu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rabilividobakomitunaxizug.pdf
    • https://cdn.shopify.com/s/files/1/0436/7941/6473/files/npm_commands_list.pdf
    • https://cdn.shopify.com/s/files/1/0437/0425/4615/files/creature_size_5e.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 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006793.bin
693b3b6515d886612575ea6f70d99e7abe09f71d17878a70000977c35a34de2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6793 4980 bytes
font_01_sfnt_off00007896.bin
70e9fa59f42e61084c6df10e04094db470f04857c3df7c562fe67c4277ed0378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7896 2968 bytes
font_02_sfnt_off00008501.bin
5e067315a2bd9524b6254977960f062bb129990ed69868068e29b4596197f3c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8501 2320 bytes
font_03_sfnt_off00008f54.bin
220f4706b739fb57ab3e33d0831bfc65d5d9ca52b8ca3df2e182b0bb98995565		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F54 10012 bytes
font_04_sfnt_off0000b1dc.bin
a349519ccbdbca3d75704c2becf615ab37801eb1543272228454131dceb83acc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB1DC 16224 bytes
font_05_sfnt_off0000c765.bin
261abcbb5c444923bf7c76f78aebe672e553505099d89e543af2c766c8705ca7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC765 5540 bytes

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