Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb9bda473bbfeb94…

MALICIOUS

PDF

69.9 KB Created: 2020-07-26 01:35:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d22f2b25d907e053a9349eb7ea91f084 SHA-1: 5116f50a7516f3382f190575e0359bddbf14a52a SHA-256: fb9bda473bbfeb9477a49bee6d121162f3eb295cf22c5ae45dc550a1f32c8816
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.001 Command and Scripting Interpreter: PowerShell

The PDF contains a large number of embedded links, many of which point to external resources. One critical heuristic identified a link to a known malicious redirector infrastructure, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains keywords related to tutorials, likely serving as a lure to disguise the 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.cc/pify?keyword=blend+for+visual+studio+2017+tutorial+pdf
    • http://files.sarahkernohan.ca/uploads/1/3/2/7/132740408/temomawilalejin-basagiji-subofebeluji-gifetaz.pdf
    • http://files.lakeshorequiltcompany.com/uploads/1/3/1/4/131438056/ludota-manozukafirujir.pdf
    • http://files.lavernerosephotograpghy.com/uploads/1/3/0/7/130775980/pejujuriname-tepawosolabu-fidinadamig-mamitepana.pdf
    • http://files.wholenikolenutrition.com/uploads/1/3/1/4/131406036/7326901.pdf
    • https://cdn.shopify.com/s/files/1/0438/2598/7734/files/94794627928.pdf
    • https://cdn.shopify.com/s/files/1/0430/6694/9799/files/83485500960.pdf
    • https://cdn.shopify.com/s/files/1/0428/2118/9788/files/78909103833.pdf
    • https://cdn.shopify.com/s/files/1/0428/2174/6847/files/mupuwotidi.pdf
    • https://cdn.shopify.com/s/files/1/0429/6946/4991/files/repizabumitow.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pexivopagutufaxusezonav.pdf
    • https://cdn.shopify.com/s/files/1/0432/0349/4043/files/4990094783.pdf
    • https://cdn.shopify.com/s/files/1/0435/2675/0362/files/56743596906.pdf
    • https://cdn.shopify.com/s/files/1/0428/2961/1171/files/zejorepobilugixazomak.pdf
    • https://cdn.shopify.com/s/files/1/0430/4204/6103/files/tolazitemepuwonubo.pdf
    • https://cdn.shopify.com/s/files/1/0434/9784/8996/files/bazusinagekewopuxesuwu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/31321710084.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_off0000ce9f.bin
fdc5014e67ed6fa557bb0816b497b7100cda491d5942fc2c685c9c0ce7ab0c79		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE9F 5432 bytes
font_01_sfnt_off0000e133.bin
71468f42972015342bd444cd91c4003e759d0d602503a4457d3b9dc57e094c91		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE133 12792 bytes

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