Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6462c84efaacddf…

MALICIOUS

PDF

45.6 KB Created: 2020-09-19 01:35:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d49a5b5f45a19689be904143d0e9400f SHA-1: 3d35ad2e79c8e6d3929b8120457c589503e8cd37 SHA-256: a6462c84efaacddf4bca5ca4ddad5e8c70d999a75cbee7da461b9634714fc672
152 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to external resources. One critical heuristic identified a link to a known malicious redirector, and another flagged the document as a link farm. The document body, though partially obfuscated, contains text related to 'words their way spelling inventory sentences' and includes the malicious redirector URL, suggesting a lure to trick users into visiting potentially harmful sites. The ML classifier also 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.link/pify?keyword=words+their+way+spelling+inventory+sentences
    • http://vuroroxa.yoyojake.com/uploads/1/3/1/3/131380771/sowup.pdf
    • http://files.riseofthemoors.org/uploads/1/3/0/7/130775746/6951713.pdf
    • http://togegu.bigskywildrags.com/uploads/1/3/1/6/131606490/nunowufoxi-lapuporawebuvel-jizirepodabawo.pdf
    • http://wenomen.neverstripaflooragain.com/uploads/1/3/0/7/130739086/1146b435a59be12.pdf
    • http://files.perfectpistolshot.com/uploads/1/3/2/7/132711961/kulovimed.pdf
    • https://cdn.shopify.com/s/files/1/0430/8054/8505/files/66999710090.pdf
    • https://cdn.shopify.com/s/files/1/0437/8558/4797/files/diablo_3_monk_paragon_points.pdf
    • https://cdn.shopify.com/s/files/1/0428/9894/8255/files/buvivalixafufenomixuveru.pdf
    • https://cdn.shopify.com/s/files/1/0460/1289/1297/files/nigerian_job_interview_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0437/7539/3946/files/kaleshwaram_project_map.pdf
    • https://cdn.shopify.com/s/files/1/0436/5769/1294/files/iscfc_footprint_calculator_preparatory_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0428/3239/6447/files/rutelezidibe.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_off00007350.bin
a10ddde3787c05d35ebbdc35d6619741ef5ee83a9a84c88fad95d7ce6c5b3a3c
pdf-font-stream PDF embedded font (sfnt) at offset 0x7350 5604 bytes
font_01_sfnt_off0000867d.bin
3515970020031de4eb0984b5caa5b8fc60977a2a6aa9deb109caffdcbffa0e11
pdf-font-stream PDF embedded font (sfnt) at offset 0x867D 10212 bytes