Malicious PDF — malware analysis report

Static analysis result for SHA-256 4106a017fa7ef412…

MALICIOUS

PDF

44.8 KB Created: 2020-08-12 18:49:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b3e02de37941b0d7e94645c3cf1f0e0 SHA-1: 0f01d652f5da8dd296556d2742381ce8edd28fcb SHA-256: 4106a017fa7ef412df5da8586e96c64505ea0e2733f80fd10e3aab166f800732
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a lure related to a 'Holt chemistry textbook pdf answer key' and embeds numerous links. One critical heuristic identified a link to known malicious redirector infrastructure at https://ttraff.ru/pify?keyword=holt+chemistry+textbook+pdf+answer+key, which is the primary IOC. Another heuristic flagged a large number of external PDF links, many hosted on Shopify, suggesting a link farm for SEO manipulation or distribution. The ML classifier strongly indicated maliciousness.

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=holt+chemistry+textbook+pdf+answer+key
    • http://files.campfido.com/uploads/1/3/1/8/131856232/78029.pdf
    • http://sipob.shophhbstore.com/uploads/1/3/2/6/132696398/godexewubiniwe_loviwosipudanu.pdf
    • http://dutinovi.nurturedbirthservices.com/uploads/1/3/2/6/132695306/fazodibasirebe.pdf
    • http://files.luisriverapercussion.com/uploads/1/3/1/8/131871698/bavupid_vemizezovad_fifage_biton.pdf
    • http://files.asiamannwellness.com/uploads/1/3/1/3/131384470/b99d93ec.pdf
    • https://cdn.shopify.com/s/files/1/0431/2757/0596/files/setebesilamasomef.pdf
    • https://cdn.shopify.com/s/files/1/0431/0673/0138/files/91322329021.pdf
    • https://cdn.shopify.com/s/files/1/0433/8925/5847/files/5960966140.pdf
    • https://cdn.shopify.com/s/files/1/0428/9373/8143/files/jozivevomizajifepoxiv.pdf
    • https://cdn.shopify.com/s/files/1/0431/2150/8509/files/nibag.pdf
    • https://cdn.shopify.com/s/files/1/0433/5419/4085/files/zuvuvur.pdf
    • https://cdn.shopify.com/s/files/1/0432/0854/0324/files/goxojizagit.pdf
    • https://cdn.shopify.com/s/files/1/0431/9857/8848/files/nosunuwirolidi.pdf
    • https://cdn.shopify.com/s/files/1/0437/8217/6917/files/abigeato_significado.pdf
    • https://cdn.shopify.com/s/files/1/0449/6372/5480/files/agile_software_development_principles_patterns_and_practices_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/33647917740.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_off00006617.bin
acc0d9315ef87f4f38c8b7226d5c377919816bf787d9b2aebe1e42dae4cde4e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6617 5820 bytes
font_01_sfnt_off000079cc.bin
3ffbf81c65ae43e85529c922871c644121142b927054d67fd7629c4239ff37d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79CC 13904 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.