Malicious PDF — malware analysis report

Static analysis result for SHA-256 73649690566e871d…

MALICIOUS

PDF

51.3 KB Created: 2020-08-23 12:44:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd23da08cb18bb21ab4e4cf653dd4d76 SHA-1: 0490f5c9213a654a02d8dd1a1fd3d718453211aa SHA-256: 73649690566e871d7627fdcb0553df6ba306b87026a3fc03909727ead7b60a32
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'ttraff.cc'. The document body, though heavily obfuscated, contains the same URL and a reference to 'trial balance sheet meaning in gujarati', suggesting a lure. The presence of a large number of external PDF links, many hosted on Shopify, indicates a potential SEO link farm or content stuffing tactic to obscure the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=trial+balance+sheet+meaning+in+gujarati
    • http://files.jimmydebutts.com/uploads/1/3/2/6/132681771/5011483.pdf
    • http://files.artwithsas.com/uploads/1/3/1/3/131398347/6418816.pdf
    • http://files.broadwaydanceeh.com/uploads/1/3/1/6/131636655/pozefupemamodebu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0430/4994/3202/files/kapewawere.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/29878061118.pdf
    • https://cdn.shopify.com/s/files/1/0432/1175/1579/files/mexabulipudufexiwoluvib.pdf
    • https://cdn.shopify.com/s/files/1/0430/7661/6341/files/fabitogagumegana.pdf
    • https://cdn.shopify.com/s/files/1/0433/7221/6483/files/mabebowive.pdf
    • https://cdn.shopify.com/s/files/1/0437/9282/6517/files/58990411594.pdf
    • https://cdn.shopify.com/s/files/1/0441/1283/8808/files/85292730141.pdf
    • https://cdn.shopify.com/s/files/1/0431/6623/6826/files/70789622270.pdf
    • https://cdn.shopify.com/s/files/1/0438/5538/0630/files/merge_sort_algorithm_complexity_analysis.pdf
    • https://cdn.shopify.com/s/files/1/0427/9664/6556/files/29776528949.pdf
    • https://cdn.shopify.com/s/files/1/0429/7929/5383/files/retorolevedijine.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/
    • http://scripts.sil.org/OFL
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000057ad.bin
9ac834768a91352911ea5b31bef17be6c4d4f651458fe36010aff60fa0e15418		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57AD 5380 bytes
font_01_sfnt_off000069c1.bin
2535dc2a20a14ec24371d6210f562af3db6543e8b5eda864fc34315cd59d3f37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69C1 5316 bytes
font_02_sfnt_off00007a97.bin
7a0f664baf8b460e9002e37adcd9b50afd7225a83c9982d9573fc78aa14c34c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A97 9876 bytes
font_03_sfnt_off00009c99.bin
0b3f503ff8ff00c06eb2646a6d0933b92a04c3dd926e9b4224cf1eeff926f012		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C99 16604 bytes
font_04_sfnt_off0000b3b4.bin
c4869f4910101e9de114603d80c87e7465cc14a3edf423f39a6ef78b10429b6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B4 2608 bytes

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