Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cf50f679c7687fb…

MALICIOUS

PDF

44.2 KB Created: 2020-08-16 23:07:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f70455e10a1ae541093f438997ea4c90 SHA-1: 3be272f1aac263478397915fc4396d77f6c4ea61 SHA-256: 4cf50f679c7687fb58a0faead46319d441fd5d493b78345e8408edba9db76eab
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1204.002 Malicious File: User Execution

The PDF was flagged as malicious by a machine learning classifier and contains a link farm with 30 external PDF links. One of these links, 'https://ttraff.cc/pify?keyword=baal+veer+ki+picture', points to a known malicious redirector. The document body contains garbled text but also includes the same URLs found in the heuristics, suggesting a deliberate attempt to obscure the malicious nature of the links. The primary attack pattern appears to be SEO poisoning or a link farm designed to distribute malicious content or manipulate search results.

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=baal+veer+ki+picture
    • http://modem.williamsburgdoula.com/uploads/1/3/1/0/131070859/gutun.pdf
    • http://files.capitalchallenge.org/uploads/1/3/0/7/130739107/4826c9.pdf
    • http://files.phonomenon.net/uploads/1/3/1/3/131379828/6c3f197cea6.pdf
    • http://files.calvertart.com/uploads/1/3/2/6/132682640/rimowivovorapujuba.pdf
    • http://files.myfreedomfellowship.com/uploads/1/3/1/3/131380759/sagejiwonutabekagope.pdf
    • https://cdn.shopify.com/s/files/1/0437/9534/9661/files/diglossia_bilingualism_and_multilingualism.pdf
    • https://cdn.shopify.com/s/files/1/0435/0961/2712/files/what_is_a_serial_key.pdf
    • https://cdn.shopify.com/s/files/1/0439/0558/1211/files/leave_letter_format_in_english_for_school.pdf
    • https://cdn.shopify.com/s/files/1/0430/7327/4018/files/53463143108.pdf
    • https://cdn.shopify.com/s/files/1/0428/8672/5795/files/58846361797.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/78299439052.pdf
    • https://cdn.shopify.com/s/files/1/0431/0378/1015/files/rasapixabawogifomasawujik.pdf
    • https://cdn.shopify.com/s/files/1/0429/9590/8761/files/jalasovojafutagoxuzu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1266/1152/files/branding_strategy_examples.pdf
    • https://cdn.shopify.com/s/files/1/0435/4015/2479/files/kipadarozev.pdf
    • https://cdn.shopify.com/s/files/1/0430/5548/0981/files/probability_using_permutations_and_combinations_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0432/2797/1741/files/mathematical_induction_questions.pdf
    • https://cdn.shopify.com/s/files/1/0431/0820/4708/files/84968954928.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_off0000612d.bin
95a5c746d910cee083c9aa937f8f82a7bc41588bb5d24322f08d9a32032eca51		 pdf-font-stream PDF embedded font (sfnt) at offset 0x612D 4920 bytes
font_01_sfnt_off00007200.bin
226f26a89dbc4170bd9c6d5014b061b291058e3db9d0d53347d81fd60f4184bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7200 15616 bytes

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