Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc5822536991d3ca…

MALICIOUS

PDF

37.7 KB Created: 2020-08-31 17:54:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0bb273690d34dd38c0925ca943d84af2 SHA-1: 815384e445039031818f4c7a841d9bbc757c3c09 SHA-256: cc5822536991d3ca266a0b81090a475248c52abe82631856dacda42ffbd709e8
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, many pointing to Shopify-hosted PDF documents, which is indicative of a link farm. One primary URL, 'https://ttraff.com/wix?keyword=6.+03+calorimetry+lab+report', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but includes the primary malicious URL.

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.com/wix?keyword=6.+03+calorimetry+lab+report
    • https://cdn.shopify.com/s/files/1/0437/8948/4190/files/84778998904.pdf
    • https://cdn.shopify.com/s/files/1/0437/2175/2726/files/51662179820.pdf
    • https://cdn.shopify.com/s/files/1/0440/7338/6136/files/bsava_manual_of_rabbit_medicine.pdf
    • https://cdn.shopify.com/s/files/1/0430/8657/7828/files/understanding_pathophysiology_5th_edition_free.pdf
    • https://cdn.shopify.com/s/files/1/0428/2508/9191/files/devi_atharvashirsha_in_kannada.pdf
    • https://cdn.shopify.com/s/files/1/0434/0681/9493/files/criminal_law_1_reyes.pdf
    • https://cdn.shopify.com/s/files/1/0439/4424/7451/files/all_in_one_english_class_10_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0457/6342/8516/files/apus_launcher_no_ads.pdf
    • https://cdn.shopify.com/s/files/1/0430/7173/3917/files/bakajop.pdf
    • https://cdn.shopify.com/s/files/1/0434/3277/1734/files/online_flowchart_template_word.pdf
    • https://cdn.shopify.com/s/files/1/0434/8831/3506/files/94710244993.pdf
    • https://cdn.shopify.com/s/files/1/0431/5211/3820/files/revenue_recognition_methods.pdf
    • https://cdn.shopify.com/s/files/1/0436/3934/1216/files/falamudomani.pdf
    • https://cdn.shopify.com/s/files/1/0437/1261/0472/files/95192768421.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_off000055ab.bin
2ce7686afa3b317348e7af7fde32667da61272289ab8f37f160d927c7a83bd7b
pdf-font-stream PDF embedded font (sfnt) at offset 0x55AB 5540 bytes
font_01_sfnt_off0000686d.bin
4b4201e50aca1bd42a33689100697668f72264fb6cb52f6dc15f88d7bb8352d6
pdf-font-stream PDF embedded font (sfnt) at offset 0x686D 9980 bytes