Malicious PDF — malware analysis report

Static analysis result for SHA-256 361fc05798d30f14…

MALICIOUS

PDF

35.8 KB Created: 2020-08-01 16:13:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5b228d1ed701e9a0ed88fd535f8a156 SHA-1: 3823402faa9072fd3f6fd0b895bc9bfb29c22336 SHA-256: 361fc05798d30f141415d187d88b588268f107aa30a4f59d8276faca81567e80
152 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and contains numerous embedded links. One critical heuristic identified it as a PDF link farm, with many links pointing to a redirector service (https://ttraff.cc/pify?keyword=discord+friend+server+layout). This suggests a phishing or scam attempt where the ultimate goal is to lead the user to a malicious site through a chain of redirects.

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=discord+friend+server+layout
    • http://files.basilicatareview.com/uploads/1/3/0/7/130738951/1510656970b.pdf
    • http://files.keshofund.org/uploads/1/3/0/7/130739786/2348962.pdf
    • http://files.allsaintsmickleover.org.uk/uploads/1/3/2/6/132695388/31731.pdf
    • https://cdn.shopify.com/s/files/1/0435/4228/2399/files/97146683226.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/63537272249.pdf
    • https://cdn.shopify.com/s/files/1/0431/8845/3533/files/33225587458.pdf
    • https://cdn.shopify.com/s/files/1/0428/5448/2079/files/29003989680.pdf
    • https://cdn.shopify.com/s/files/1/0434/3683/4981/files/keratetulotebape.pdf
    • https://cdn.shopify.com/s/files/1/0434/5249/8070/files/94572537490.pdf
    • https://cdn.shopify.com/s/files/1/0435/8445/4817/files/bimusawapemok.pdf
    • https://cdn.shopify.com/s/files/1/0428/6650/7943/files/xobivavidemopexaxub.pdf
    • https://cdn.shopify.com/s/files/1/0432/2829/9428/files/kndigung_bahncard_vorlage_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0431/8933/8276/files/mobajepapetoxofeput.pdf
    • https://cdn.shopify.com/s/files/1/0431/3173/2122/files/97843503849.pdf
    • https://cdn.shopify.com/s/files/1/0431/6826/8448/files/tesatawuxu.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_off00004f0b.bin
193b26fe20b6f44d3ea7a7d698059f9bfe39fb87d2aa68c628aaf691cc847e68
pdf-font-stream PDF embedded font (sfnt) at offset 0x4F0B 5176 bytes
font_01_sfnt_off000060ca.bin
383f00a20d8350c3afb99e913f00e609901df8a5285c37c0c905aed491e3f4d3
pdf-font-stream PDF embedded font (sfnt) at offset 0x60CA 9836 bytes