Malicious PDF — malware analysis report

Static analysis result for SHA-256 a83dd44742bdbd7e…

MALICIOUS

PDF

53.5 KB Created: 2020-08-14 01:07:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 185a85c9d7914c73e436d06e240a43f1 SHA-1: 971203e20acabb3b0eda21ac5a0a3aa7a16f741c SHA-256: a83dd44742bdbd7e76c7daddb003cd1342cfb6393763d879208a02b5bdd36c2b
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector at 'ttraff.com'. The document body, though partially corrupted, suggests a lure related to 'Newsletter template design'. The presence of a large number of external PDF links, many hosted on Shopify, indicates a link farm strategy to potentially obscure the malicious redirector.

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=newsletter+template+design
    • http://files.advancedaccounting.services/uploads/1/3/1/4/131407406/a6ed8cc919.pdf
    • http://files.nursinghomeneglectatty.com/uploads/1/3/0/8/130874012/rudevesuvasid.pdf
    • http://files.thesustainablog.com/uploads/1/3/0/7/130740097/a5a3ab4b3c3d0.pdf
    • https://cdn.shopify.com/s/files/1/0429/3342/0195/files/72048517963.pdf
    • https://cdn.shopify.com/s/files/1/0430/9850/5369/files/tugodovisovopu.pdf
    • https://cdn.shopify.com/s/files/1/0431/3320/6682/files/swkotor_2_mods.pdf
    • https://cdn.shopify.com/s/files/1/0451/7163/8421/files/53436218663.pdf
    • https://cdn.shopify.com/s/files/1/0434/3722/8188/files/chrysocyon_brachyurus.pdf
    • https://cdn.shopify.com/s/files/1/0428/2518/7491/files/changing_documents.pdf
    • https://cdn.shopify.com/s/files/1/0435/3179/6632/files/tomb_of_annihilation_5e.pdf
    • https://cdn.shopify.com/s/files/1/0429/0212/6751/files/master_mind_brain_teasers.pdf
    • https://cdn.shopify.com/s/files/1/0431/4264/3868/files/65742852725.pdf
    • https://cdn.shopify.com/s/files/1/0431/5496/4637/files/74051545672.pdf
    • https://cdn.shopify.com/s/files/1/0435/4267/5608/files/mepawazu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lorabo.pdf
    • https://cdn.shopify.com/s/files/1/0434/4093/0983/files/sesexadufiwekipazifamur.pdf
    • https://cdn.shopify.com/s/files/1/0438/5597/0464/files/lumewajaxagem.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_off00007a80.bin
322c0ca79707ea8cff0d6b5edfd7056bf239232b49290a22f3e484ffa8ae51da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A80 5340 bytes
font_01_sfnt_off00008c98.bin
8770a9d16f6ec8ed1e04f7f31595c1fd3834ff76ff6f55291086ab87d6d749e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C98 2268 bytes
font_02_sfnt_off000096aa.bin
530710e1d8ee40a32bc8d9e1572f2d3cdca7af7c8edc83d4f077c4f3a86e15e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96AA 16032 bytes

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