Malicious PDF — malware analysis report

Static analysis result for SHA-256 a35fd254f9d1f686…

MALICIOUS

PDF

45.6 KB Created: 2020-08-10 05:00:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e056e7aa94c21f7de55f69fc9412fc34 SHA-1: 46669c43f00e4a197713ed21f9fb397507c1ee24 SHA-256: a35fd254f9d1f6865180c45740dd899ca0d492efe307e232ad8914446e8d0549
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many of which point to domains associated with redirectors or link farms. One critical heuristic identified a link to a known malicious redirector, ttraff.com, which is used to obscure the final malicious destination. The document body, though heavily obfuscated, also contains this URL, suggesting a social engineering lure related to academic content. No scripts were extracted, but the presence of multiple suspicious URLs indicates a phishing or redirection attack.

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=parametric+design+in+architecture+fundamentals+methods+applications+pdf
    • http://tuvezox.metafarms.com/uploads/1/3/0/8/130815017/3310d33e96b15d.pdf
    • http://xoxaru.lakechristianministries.org/uploads/1/3/1/4/131453540/9623529.pdf
    • http://karedupo.broadwaysilkens.com/uploads/1/3/0/8/130874633/pebepakokemuvu_voviwum_zajus.pdf
    • https://cdn.shopify.com/s/files/1/0434/1458/5509/files/asterix_le_gaulois.pdf
    • https://cdn.shopify.com/s/files/1/0430/3863/8241/files/doxawinekodaxoxamituveji.pdf
    • https://cdn.shopify.com/s/files/1/0433/3761/3461/files/legironurifidunupuwadunud.pdf
    • https://cdn.shopify.com/s/files/1/0429/2168/9254/files/tulojigejasigaj.pdf
    • https://cdn.shopify.com/s/files/1/0431/6702/3259/files/fasolakiralubutamok.pdf
    • https://cdn.shopify.com/s/files/1/0433/6674/4216/files/mpsc_sports_list.pdf
    • https://cdn.shopify.com/s/files/1/0427/6197/8023/files/lasegibazavusuwefi.pdf
    • https://cdn.shopify.com/s/files/1/0434/0364/0984/files/trumpet_voluntary_organ_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0435/1790/3008/files/xolewejabopezulabele.pdf
    • https://cdn.shopify.com/s/files/1/0433/1431/5422/files/35596218731.pdf
    • https://cdn.shopify.com/s/files/1/0434/4479/7600/files/semariramalozi.pdf
    • https://cdn.shopify.com/s/files/1/0439/1878/6728/files/social_media_marketing_presentation.pdf
    • https://cdn.shopify.com/s/files/1/0440/0644/1110/files/ssh_authorized_keys_permissions.pdf
    • https://cdn.shopify.com/s/files/1/0432/4638/7367/files/plymouth_road_test.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000073b8.bin
aaea8669140d978e1a780f116d033dcf1f8e357a0ed653673b23542d3c5e7ffe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73B8 5568 bytes
font_01_sfnt_off0000867f.bin
82621a6de6c080e89c0eff95b652933a2af8fedcf3461687b2f53c9672317c71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x867F 9860 bytes

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