Malicious PDF — malware analysis report

Static analysis result for SHA-256 af6aa02e8c896b65…

MALICIOUS

PDF

42.2 KB Created: 2020-08-16 13:39:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f974e028da115758a596fb743ddc8ab2 SHA-1: f5f002d4d079a99425c619f32281416671b15b02 SHA-256: af6aa02e8c896b651669e4442eee90d3ac164bb489af4363a7a6f9fc41bd028e
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with a critical heuristic firing for a malicious redirector link to 'https://ttraff.ru/wb?keyword=teaching%20pronunciation%20lesson%20plan%20pdf'. Another critical heuristic identified a PDF link farm with 30 external links, many hosted on shopify.com. The ML classifier also strongly indicated maliciousness. The document body is heavily corrupted, but the presence of numerous links suggests a campaign to drive traffic to malicious sites, likely for phishing or malware distribution.

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/wb?keyword=teaching%20pronunciation%20lesson%20plan%20pdf
    • http://girapo.swiftcreekguitars.com/uploads/1/3/1/6/131637056/8ea9944071.pdf
    • http://files.artsequality.org/uploads/1/3/1/4/131482997/fenesibi-jozonelinona-wamuruwuwodubex.pdf
    • http://files.gabriellaquiroz.com/uploads/1/3/0/8/130873741/povezisijeji-donikomo-xukebofekubaw-tilap.pdf
    • http://files.amymoenart.com/uploads/1/3/2/7/132740619/7162139.pdf
    • http://files.saynoto66d.info/uploads/1/3/0/9/130969427/buxoliwoxuzi-satetalumena-viraz.pdf
    • https://cdn.shopify.com/s/files/1/0437/5393/0901/files/17801005902.pdf
    • https://cdn.shopify.com/s/files/1/0433/5907/6510/files/bitsat_last_year_papers.pdf
    • https://cdn.shopify.com/s/files/1/0434/0862/1719/files/dadegusemo.pdf
    • https://cdn.shopify.com/s/files/1/0430/0655/8359/files/21761028564.pdf
    • https://cdn.shopify.com/s/files/1/0436/9770/1032/files/32429244310.pdf
    • https://cdn.shopify.com/s/files/1/0433/6277/9295/files/69688576073.pdf
    • https://cdn.shopify.com/s/files/1/0429/3866/3079/files/autoestima_alta_y_baja.pdf
    • https://cdn.shopify.com/s/files/1/0429/2198/4166/files/fetiwuxesetisaf.pdf
    • https://cdn.shopify.com/s/files/1/0430/7091/4717/files/corriges_cahier_alter_ego_2_plus.pdf
    • https://cdn.shopify.com/s/files/1/0446/3286/6979/files/rikuwabe.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_off00006632.bin
ff2222a042bc59f956824d9e412d3a5a5f053fc33fe0652eb815ed8cecff3a65		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6632 5368 bytes
font_01_sfnt_off00007865.bin
c8468ab079df37d6963745df29b8d5cb644868dd44f0bb7d803fe9a25be9c9cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7865 10296 bytes

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