Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ac09b0492200cf0…

MALICIOUS

PDF

39.7 KB Created: 2020-09-18 00:01:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 007f97ddd7e31442eb919e7f4fb54ed8 SHA-1: ca95908702ca821598fc8c2d426892faf968e2cc SHA-256: 7ac09b0492200cf0a0eb82374c3e0d6b9193885082d198f21c2b9a20f56ff1b3
224 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable hosting and appear to be part of a link farm. One critical heuristic identified a link to a known malicious redirector at 'ttraff.com'. The document also contains a heuristic indicating it is a lure for a password-protected archive, suggesting the user is expected to download an encrypted file. The presence of embedded URLs and the link farm structure indicate an attempt to drive traffic to malicious or potentially malicious sites, likely for further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/wix?keyword=flash+rom+apk+download
    • http://files.saraniedzwiecki.com/uploads/1/3/1/4/131453226/dizofuxut.pdf
    • http://files.enspirebrandcbd.com/uploads/1/3/1/8/131856956/7975505.pdf
    • http://jebox.chestervilledancers.com/uploads/1/3/1/1/131163930/6339830.pdf
    • http://files.rosshimliephoto.com/uploads/1/3/1/8/131856161/2094607.pdf
    • http://files.rpeake.com/uploads/1/3/0/8/130874101/tuwogupu-domureguv.pdf
    • http://files.eyeslikemineinc.org/uploads/1/3/1/4/131482819/9763944.pdf
    • http://files.cameronayres.com/uploads/1/3/0/7/130739996/gatazaro.pdf
    • http://files.stthomaskids.com/uploads/1/3/0/7/130775808/mozasesoda-woxaximopixi-kojimesuli-refigiwowi.pdf
    • http://tinabuful.nickydelariva.com/uploads/1/3/0/9/130969260/mudub.pdf
    • http://zonirunem.orthodoxservantleaders.com/uploads/1/3/1/4/131482933/jiloniluni.pdf
    • http://fenudidi.bugsweedsmore.com/uploads/1/3/0/7/130739415/fuliw-tegazirile.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0469/2826/5371/files/vivikebamaxaruwaj.pdf
    • https://cdn.shopify.com/s/files/1/0434/4872/9766/files/usps_com_change_of_address_form.pdf
    • https://cdn.shopify.com/s/files/1/0435/3874/3450/files/wakotemituxegawefa.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_off00005cb7.bin
954fa12699498cf6f7ab5610b4da2384407c08e0f6146c6af6c36dbab55bc856		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CB7 5312 bytes
font_01_sfnt_off00006ea8.bin
2f88d62716b0a1c9ed3037aa7ac42ad4a7318abf8fab16aa2f00181e574a58cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EA8 10448 bytes

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