Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee88125ce4092e7a…

MALICIOUS

PDF

43.8 KB Created: 2020-08-27 23:44:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21c68b1402364cfbbe6310db1f925e9b SHA-1: 2832be90d7543cd12c77a8143f0a4361fff66bb2 SHA-256: ee88125ce4092e7a786f2c8ccf29d00825425bc8c257cb4b2aa7cd891699dcfc
154 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier as malicious and contains a critical heuristic indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains multiple embedded URLs, including a primary malicious redirector at 'https://ttraff.com/pify?keyword=tales+from+the+loop+pdf'. The presence of numerous links, many pointing to Shopify domains, suggests a link farm or SEO poisoning tactic to distribute malicious content. No scripts were extracted from this sample.

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/pify?keyword=tales+from+the+loop+pdf
    • http://files.hcmyc.org/uploads/1/3/1/1/131164067/jusam_boxeme_gikibaxon_zezosodej.pdf
    • http://files.gardenjoyca.com/uploads/1/3/1/1/131164236/72c4b.pdf
    • https://cdn.shopify.com/s/files/1/0437/8125/9421/files/23910704885.pdf
    • https://cdn.shopify.com/s/files/1/0438/3657/1805/files/business_agreement_letter_sample.pdf
    • https://cdn.shopify.com/s/files/1/0434/9673/4885/files/wabirajisasesedexeturoz.pdf
    • https://cdn.shopify.com/s/files/1/0440/2964/0854/files/46829522797.pdf
    • https://cdn.shopify.com/s/files/1/0440/9081/8712/files/29249166450.pdf
    • https://cdn.shopify.com/s/files/1/0441/3086/1208/files/advantages_of_using_internet.pdf
    • https://cdn.shopify.com/s/files/1/0437/6448/2202/files/affective_filter_hypothesis.pdf
    • https://cdn.shopify.com/s/files/1/0431/1449/6161/files/wojerosipewokemu.pdf
    • https://cdn.shopify.com/s/files/1/0427/8353/9366/files/cambridge_igcse_english_lesson_plans.pdf
    • https://cdn.shopify.com/s/files/1/0437/0392/6939/files/95333620292.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_off00006e3b.bin
c133e38c276595e3107002974f5e099ed3cc20c7b07c475fcb913df90feb84a4
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E3B 5228 bytes
font_01_sfnt_off00007fda.bin
ac92e6b2c43e82d8b4ebfe38c8bc553be553257be1da6e83a9450ff765ad4478
pdf-font-stream PDF embedded font (sfnt) at offset 0x7FDA 10272 bytes