Malicious PDF — malware analysis report

Static analysis result for SHA-256 6496165155238177…

MALICIOUS

PDF

43.0 KB Created: 2020-08-06 10:07:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd1437fd966849765d97418fa94afe46 SHA-1: b4198ae307fd0fcf1def7288b9b95adabf265ee2 SHA-256: 6496165155238177b2987857c54d2f79ded321b0f4a4c5215502ccecb3a85d1f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by an ML classifier and contains a link to a known malicious redirector. The document body, though partially corrupted, contains text related to PDF compression and includes the malicious URL, suggesting a lure to a phishing or malware distribution site. The presence of numerous external PDF links, many pointing to unknown domains, further supports the classification as a link farm designed to distribute 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=compress+pdf+file+to+smaller+size+online+free
    • http://sejux.coastalretreatsdevon.com/uploads/1/3/0/7/130775934/aa66f.pdf
    • http://mukuvadop.ambersballoons.com/uploads/1/3/0/7/130776542/7279664.pdf
    • http://files.dance4him.org/uploads/1/3/0/8/130814588/rujiz.pdf
    • http://files.gingermarketinghq.com/uploads/1/3/2/7/132740439/xeforu_tukoganoruxemuw_rejepogamoneze_timitukaxapus.pdf
    • http://files.crossroads-university.com/uploads/1/3/1/4/131453260/rabarunuwunip.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/3210/1543/files/57559638642.pdf
    • https://cdn.shopify.com/s/files/1/0430/0436/2906/files/onyxia_quest_chain.pdf
    • https://cdn.shopify.com/s/files/1/0432/1620/8036/files/16099524874.pdf
    • https://cdn.shopify.com/s/files/1/0432/2865/9870/files/tativebutemuzapujijuga.pdf
    • https://cdn.shopify.com/s/files/1/0434/1058/7800/files/xotivifonimadobosa.pdf
    • https://cdn.shopify.com/s/files/1/0439/0718/6843/files/19958395662.pdf
    • https://cdn.shopify.com/s/files/1/0431/2550/6208/files/mtbf_mttr_availability_calculation.pdf
    • https://cdn.shopify.com/s/files/1/0433/4996/6998/files/nuxomudisolukutedetizana.pdf
    • https://cdn.shopify.com/s/files/1/0429/8027/8426/files/96751204207.pdf
    • https://cdn.shopify.com/s/files/1/0431/0512/4516/files/95078339386.pdf
    • https://cdn.shopify.com/s/files/1/0438/9067/1771/files/standard_def_resolution.pdf
    • https://cdn.shopify.com/s/files/1/0433/6913/6280/files/cracking_the_code_interview.pdf
    • https://cdn.shopify.com/s/files/1/0432/9183/6566/files/autonomous_vehicle_system_architecture.pdf
    • https://cdn.shopify.com/s/files/1/0434/7274/8710/files/sosamovasakitokerelusul.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006958.bin
6e3cf9963781c4d2d04a53392512015a1aba760e76bce9a1e479cd5b53302603		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6958 5144 bytes
font_01_sfnt_off00007abf.bin
98eea7b9bc1af5b78d3c898bf9f256893727edb300630e75e84a906ccc2a4c5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7ABF 10556 bytes

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