Malicious PDF — malware analysis report

Static analysis result for SHA-256 929676050aa8b567…

MALICIOUS

PDF

41.9 KB Created: 2020-08-17 11:52:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2e40fdc802122874123536445c68164b SHA-1: 2be064e12ea909acb0543a5b10fbc1aa57ddb1e8 SHA-256: 929676050aa8b567dd2400fb28e6049de860e2ebbb6079362d6c66f02b9faa75
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many of which point to a link farm designed to redirect users to malicious infrastructure. The primary redirector URL is https://ttraff.ru/pify?keyword=bromhidrosis+pediatria+pdf. The ML classifier strongly indicated maliciousness, and the presence of a malicious redirector confirms the intent to lead users to harmful content.

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=bromhidrosis+pediatria+pdf
    • http://famanani.kelsrodreel.com/uploads/1/3/0/8/130815017/worikixaxepizuf.pdf
    • https://cdn.shopify.com/s/files/1/0431/4293/8784/files/jijujawagafenober.pdf
    • https://cdn.shopify.com/s/files/1/0434/8795/3053/files/77492336668.pdf
    • https://cdn.shopify.com/s/files/1/0436/2554/5890/files/fipotuj.pdf
    • https://cdn.shopify.com/s/files/1/0433/8548/7516/files/66542175097.pdf
    • https://cdn.shopify.com/s/files/1/0441/4029/8392/files/texagabijupenavinugepugif.pdf
    • https://cdn.shopify.com/s/files/1/0437/2827/3562/files/punctuation_practice_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0433/5570/1398/files/fufitox.pdf
    • https://cdn.shopify.com/s/files/1/0427/9848/1564/files/lolowosokabu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/11783771814.pdf
    • https://cdn.shopify.com/s/files/1/0428/1358/7623/files/american_english_file_second_edition_answer_key.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000059be.bin
f44f62a3b40f101922254bc5892151cfeaac3bac83a1ba795555f94d208b4cf8
pdf-font-stream PDF embedded font (sfnt) at offset 0x59BE 4980 bytes
font_01_sfnt_off00006aa7.bin
eee363bdf9599d7588ea1af8185965a40fc4cf4ec2f130e9f92781a61675f024
pdf-font-stream PDF embedded font (sfnt) at offset 0x6AA7 10076 bytes
font_02_sfnt_off00008d0d.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x8D0D 4324 bytes