Malicious PDF — malware analysis report

Static analysis result for SHA-256 2871b0cbd1644cd8…

MALICIOUS

PDF

46.9 KB Created: 2020-08-06 12:24:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8f5e6c3113f573f0d6131e3489d3a90 SHA-1: 66776f0312492a6b2dbcb61abd2ff25f84485a7f SHA-256: 2871b0cbd1644cd83b769e846dc0cfbf97c06623474f34db2cea3fe4e47996fa
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to `https://ttraff.cc/pify?keyword=classification+of+living+organisms+worksheet+pdf`. This indicates the document's primary purpose is to redirect users to malicious infrastructure. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to improve search engine visibility for malicious content. The ML classifier also strongly flagged this PDF as malicious.

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=classification+of+living+organisms+worksheet+pdf
    • http://files.katbalames.com/uploads/1/3/1/1/131164024/xetitaxuwigidiw_torazuxode.pdf
    • http://zibori.jhmartist.com/uploads/1/3/1/3/131381204/f6d337.pdf
    • http://vurikajuv.crazydaisymarketing.com/uploads/1/3/0/8/130874633/ketaloxef.pdf
    • http://files.harnischart.com/uploads/1/3/2/6/132681743/d0fdf737.pdf
    • https://cdn.shopify.com/s/files/1/0437/0441/8455/files/fanos.pdf
    • https://cdn.shopify.com/s/files/1/0429/6572/9429/files/47344327602.pdf
    • https://cdn.shopify.com/s/files/1/0432/3062/5950/files/44181148515.pdf
    • https://cdn.shopify.com/s/files/1/0429/0094/7103/files/88870535247.pdf
    • https://cdn.shopify.com/s/files/1/0431/6856/3355/files/77777487586.pdf
    • https://cdn.shopify.com/s/files/1/0430/1769/9477/files/933662726.pdf
    • https://cdn.shopify.com/s/files/1/0437/3302/4929/files/bluejacking_seminar_report.pdf
    • https://cdn.shopify.com/s/files/1/0435/6676/0095/files/42458943661.pdf
    • https://cdn.shopify.com/s/files/1/0429/7110/3395/files/vexafaviguxaxagatojigip.pdf
    • https://cdn.shopify.com/s/files/1/0429/7395/4204/files/kijololejo.pdf
    • https://cdn.shopify.com/s/files/1/0434/0849/0663/files/22791377242.pdf
    • https://cdn.shopify.com/s/files/1/0435/4444/5092/files/cours_de_francais_niveau_a1.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a58.bin
2da310facb7128a8d5435e9b31eb9d254cf4de04ee0a67da40ccf904543c4793		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A58 5596 bytes
font_01_sfnt_off00007d41.bin
5ba6dab6d4fbd5656c2c78d5decc55b977a0e35aa15ba26b19052e97df0fe345		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D41 10240 bytes
font_02_sfnt_off0000a052.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA052 4324 bytes

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