Malicious PDF — malware analysis report

Static analysis result for SHA-256 98d7085d90f8afd1…

MALICIOUS

PDF

41.8 KB Created: 2020-08-23 06:18:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 14413beea729686b1e364f193a3179a0 SHA-1: b972b10bd440777f7c0805601f821a4a2d7d75bd SHA-256: 98d7085d90f8afd1f265081d0312a64fa48bce0d400a7d1cdb75f40c73b96e71
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify-hosted PDFs, which is indicative of a link farm. One of the primary links, 'https://ttraff.ru/pify?keyword=schedule+a+itemized+deductions+worksheet', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but includes the malicious redirector URL.

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=schedule+a+itemized+deductions+worksheet
    • http://suvesi.nicrn.org/uploads/1/3/1/4/131438641/torubupas-kebewawikalota-lelow-rivizepelos.pdf
    • http://likex.vintagecuriosa.ca/uploads/1/3/0/8/130874540/218f625d599.pdf
    • https://cdn.shopify.com/s/files/1/0440/5461/0070/files/64504488355.pdf
    • https://cdn.shopify.com/s/files/1/0431/6587/6378/files/spoken_english_file_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0440/5772/3030/files/school_bus_engine_diagram.pdf
    • https://cdn.shopify.com/s/files/1/0429/4891/9450/files/renurezovapuvumiri.pdf
    • https://cdn.shopify.com/s/files/1/0443/5014/4668/files/metformina_hcl_1000_mg_para_que_sirve.pdf
    • https://cdn.shopify.com/s/files/1/0434/2913/4501/files/vujiwosazuxodof.pdf
    • https://cdn.shopify.com/s/files/1/0436/9842/1913/files/7077349425.pdf
    • https://cdn.shopify.com/s/files/1/0427/5660/4070/files/gakinizolexusokifobu.pdf
    • https://cdn.shopify.com/s/files/1/0431/8982/9800/files/rajog.pdf
    • https://cdn.shopify.com/s/files/1/0430/6986/6141/files/40258602871.pdf
    • https://cdn.shopify.com/s/files/1/0432/7273/2836/files/datis.pdf
    • https://cdn.shopify.com/s/files/1/0428/2672/7580/files/mexekizujolumijumerizosa.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_off00006331.bin
f7453605989749d9f943f67f1ef493d44edd6b92362bc7704dd77faa1beefcdd
pdf-font-stream PDF embedded font (sfnt) at offset 0x6331 5488 bytes
font_01_sfnt_off000075c2.bin
d789e48dff182e82bf7e1cc30e220b96016e70fa3ca1d8370dd5b48e6a235911
pdf-font-stream PDF embedded font (sfnt) at offset 0x75C2 10736 bytes