Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae2a316a9d7637df…

MALICIOUS

PDF

39.9 KB Created: 2020-08-08 18:59:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dea5b154ad0ab69d2252766ed924a4b6 SHA-1: aff168e8bfbb45fa981030fdf4dc28566e9fc3ba SHA-256: ae2a316a9d7637df94f9e2466a604568a51c44b7989fd90c76888f3d17214637
152 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm or SEO manipulation scheme, embedding a large number of links to external PDF files. One of these links, 'https://ttraff.ru/pify?keyword=numerologia+cabalistica+calculo+pdf', is identified as a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, and the document body is heavily obfuscated, but the presence of the malicious redirector and the link farm structure strongly suggest a malicious intent, likely to drive traffic to malicious infrastructure or for SEO abuse.

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=numerologia+cabalistica+calculo+pdf
    • http://files.greensistah.com/uploads/1/3/1/0/131070230/femibekuvase.pdf
    • http://fusebug.spanawaylakemonstersbbc.com/uploads/1/3/0/8/130874207/3649243.pdf
    • http://files.skycruiseandtravel.com/uploads/1/3/1/4/131452935/f80721456c58c7.pdf
    • https://cdn.shopify.com/s/files/1/0429/4973/8650/files/pubebogodaxoxozudogib.pdf
    • https://cdn.shopify.com/s/files/1/0437/4865/5265/files/wiczenia_jzyka_angielskiego_dla_pocztkujcych.pdf
    • https://cdn.shopify.com/s/files/1/0431/8114/6280/files/93149567621.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zorosibal.pdf
    • https://cdn.shopify.com/s/files/1/0432/7954/8574/files/zabepog.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/3100392900.pdf
    • https://cdn.shopify.com/s/files/1/0434/0790/0835/files/49037153034.pdf
    • https://cdn.shopify.com/s/files/1/0437/9649/6544/files/ielts_sample_answer_sheet_writing.pdf
    • https://cdn.shopify.com/s/files/1/0431/5152/4008/files/xovogejupaduxo.pdf
    • https://cdn.shopify.com/s/files/1/0433/5727/4270/files/25520699471.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_off00005dae.bin
335c6b57ca350329b48f6da22c04fb0921ef4700051609c992b63f5127b1b6c6
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DAE 5584 bytes
font_01_sfnt_off00007093.bin
96119c03d28dbf7e019d5c45926f0dcdb453ce5176026b35778fa19423c1c393
pdf-font-stream PDF embedded font (sfnt) at offset 0x7093 10284 bytes