Malicious PDF — malware analysis report

Static analysis result for SHA-256 85f2d3351549dc98…

MALICIOUS

PDF

38.4 KB Created: 2020-08-04 16:26:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34d62eb67e5c47adf3d4a02f747a9334 SHA-1: 77d8821e936416d3b214cdc75ee67ed06f585f4b SHA-256: 85f2d3351549dc9853bbc34515212420750e635ea8f7514f0c117f8156bcba1f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one pointing to a known malicious redirector at `https://ttraff.cc/pify?keyword=reality+therapy+journal+pdf`. This suggests the document is part of a link farm or SEO poisoning campaign designed to redirect users to malicious 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.cc/pify?keyword=reality+therapy+journal+pdf
    • http://files.pitzeradventures.com/uploads/1/3/0/9/130969659/bexatotavotew-kezalutow.pdf
    • http://files.jasmineaware.com/uploads/1/3/1/4/131454816/pobara-repajupigu-patomasuxesu-lajijupapu.pdf
    • http://files.oregonbazaar.com/uploads/1/3/1/0/131070294/zekorud_gatotemulos.pdf
    • http://files.thenectarylkld.com/uploads/1/3/0/8/130874627/3104638.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/6526/9669/files/25667217574.pdf
    • https://cdn.shopify.com/s/files/1/0434/3015/0296/files/cours_d_atomistique_l1.pdf
    • https://cdn.shopify.com/s/files/1/0434/0446/0188/files/tesixalit.pdf
    • https://cdn.shopify.com/s/files/1/0431/6993/9612/files/zapuluvitifo.pdf
    • https://cdn.shopify.com/s/files/1/0435/2016/3999/files/38154784971.pdf
    • https://cdn.shopify.com/s/files/1/0431/1564/3031/files/76241832821.pdf
    • https://cdn.shopify.com/s/files/1/0434/8909/9938/files/fantastic_mr_fox_book.pdf
    • https://cdn.shopify.com/s/files/1/0431/9733/3668/files/sisaxu.pdf
    • https://cdn.shopify.com/s/files/1/0438/3172/2141/files/1021569224.pdf
    • https://cdn.shopify.com/s/files/1/0438/6163/9318/files/29910215781.pdf
    • https://cdn.shopify.com/s/files/1/0432/6473/7438/files/branded_ley_line_anomaly.pdf
    • https://cdn.shopify.com/s/files/1/0432/6948/8798/files/17639962620.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005850.bin
44a785847c6be806caa1f98b4e974fa65c338cefe407df6a010a813d19042c69
pdf-font-stream PDF embedded font (sfnt) at offset 0x5850 5136 bytes
font_01_sfnt_off000069d6.bin
c3fcaddf75956118fb8905c7807cc0513f1b12a6c0000fc19e028a879fe43b5a
pdf-font-stream PDF embedded font (sfnt) at offset 0x69D6 10288 bytes