Malicious PDF — malware analysis report

Static analysis result for SHA-256 3acd4fd83122a5a1…

MALICIOUS

PDF

41.4 KB Created: 2020-08-22 14:47:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31b2d4debccdcaf138b75b63177ac7bf SHA-1: 39efb0c5be3987a6aeb79af0bf89a239ab1588b5 SHA-256: 3acd4fd83122a5a1e202147482906719c217da7df7309abca89a5ca3e1007994
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is designed to lead users to malicious content. The document body and embedded URLs suggest a lure related to educational materials, likely to trick users into clicking the malicious link. The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm SEO strategy to improve search engine ranking for malicious content.

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=cambridge+igcse+first+language+english+workbook+answers
    • http://xabob.antoniacundy.com/uploads/1/3/2/6/132695219/zemimonofeba.pdf
    • http://files.bethanywelchfitness.com/uploads/1/3/0/7/130739699/noputixijuwozef_liruse_vufile_nofibejikiti.pdf
    • http://files.hombomtoys.net/uploads/1/3/1/3/131383949/joxixurifuweval_tofofenidofe_refoda_fakew.pdf
    • https://cdn.shopify.com/s/files/1/0428/4389/8019/files/pajutibolerezodo.pdf
    • https://cdn.shopify.com/s/files/1/0438/1750/0834/files/92012870685.pdf
    • https://cdn.shopify.com/s/files/1/0436/1771/4338/files/alternation_of_generation_in_archegoniate.pdf
    • https://cdn.shopify.com/s/files/1/0432/7571/4715/files/nokasejubajevob.pdf
    • https://cdn.shopify.com/s/files/1/0428/5333/5207/files/22433049028.pdf
    • https://cdn.shopify.com/s/files/1/0429/6281/3084/files/26667099296.pdf
    • https://cdn.shopify.com/s/files/1/0437/4586/9985/files/tugawedenodawogagizujolut.pdf
    • https://cdn.shopify.com/s/files/1/0433/6825/1548/files/37325663523.pdf
    • https://cdn.shopify.com/s/files/1/0432/8351/3494/files/pefoxus.pdf
    • https://cdn.shopify.com/s/files/1/0431/8524/2269/files/days_of_the_week_and_months_in_spanish.pdf
    • https://cdn.shopify.com/s/files/1/0433/1080/9256/files/munawa.pdf
    • https://cdn.shopify.com/s/files/1/0431/3566/4284/files/alexander_pope_essay_on_criticism.pdf
    • https://cdn.shopify.com/s/files/1/0427/3173/3159/files/akashic_records_book.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_off00004ca3.bin
6cf4de4aae62ea4ce9ed4b8a3df6afa60d0976b7c9a63fba15fbe37c9cd576ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4CA3 5636 bytes
font_01_sfnt_off00005fb0.bin
434dcf3b26ae955e8fcc5663437ca1aec5c236da4058d48cfb2900bc52d3f401		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FB0 10328 bytes
font_02_sfnt_off000082cc.bin
e296a61d2d303e35be9e1a35631556663d2780498efa7e8f3867bf557f172fe6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82CC 16164 bytes

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