Malicious PDF — malware analysis report

Static analysis result for SHA-256 843f9d9a4ab1c4ae…

MALICIOUS

PDF

37.9 KB Created: 2020-08-04 03:37:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a201105f6248aa6738b5dc4536de1d4e SHA-1: a66e2381c35fc9a7d1083e0212b2146a724643ca SHA-256: 843f9d9a4ab1c4ae96d6d5b15fd75da8a56a82741a7a7e60aef21c1c22ea89c0
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'ttraff.ru'. The document body, though heavily obfuscated, contains the same URL and appears to be a lure for free sheet music. This suggests an attempt to trick users into visiting a malicious site, likely for phishing or malware distribution. No scripts were extracted, but the presence of embedded URLs and the redirector heuristic strongly indicate malicious intent.

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.ru/pify?keyword=rewrite+the+stars+free+piano+sheet+music+pdf
    • http://files.missdabbeekeh.com/uploads/1/3/1/4/131437061/mubogirutajekir-zevajem.pdf
    • http://files.teamanton.net/uploads/1/3/1/4/131407887/woguguxibux-malile-xuxuvipawa.pdf
    • http://files.lakeodessaarts.com/uploads/1/3/2/6/132681030/544629.pdf
    • http://files.jaxmta.org/uploads/1/3/1/1/131164479/dd11544a18286.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/5738/9472/files/90547747306.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/56293754430.pdf
    • https://cdn.shopify.com/s/files/1/0431/1557/7504/files/wodulabowuzizuw.pdf
    • https://cdn.shopify.com/s/files/1/0434/3096/9511/files/lapuferirigu.pdf
    • https://cdn.shopify.com/s/files/1/0437/1503/5291/files/3300817439.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/darusatotarolusitoganeg.pdf
    • https://cdn.shopify.com/s/files/1/0431/9959/4656/files/12836025522.pdf
    • https://cdn.shopify.com/s/files/1/0430/9496/6429/files/rufobozagata.pdf
    • https://cdn.shopify.com/s/files/1/0432/0513/2456/files/75704289086.pdf
    • https://cdn.shopify.com/s/files/1/0431/1390/6327/files/41540760813.pdf
    • https://cdn.shopify.com/s/files/1/0433/2063/9646/files/53745821752.pdf
    • https://cdn.shopify.com/s/files/1/0436/4409/2566/files/mubupenus.pdf
    • https://cdn.shopify.com/s/files/1/0435/2344/0792/files/tanofevi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000048e3.bin
25010ad108defca936c9b6091eaf540978f855c40284462c5bf601a525851889		 pdf-font-stream PDF embedded font (sfnt) at offset 0x48E3 5344 bytes
font_01_sfnt_off00005aee.bin
6fd0d36bcc25b14c62fe2bbff306efa2c88af9b0075ac7c7ef9b0ec1ed9120fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AEE 9680 bytes
font_02_sfnt_off00007c28.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C28 4324 bytes

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