Malicious PDF — malware analysis report

Static analysis result for SHA-256 38cf52a20cb7f1e3…

MALICIOUS

PDF

40.9 KB Created: 2020-08-11 23:43:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e6adb827acf52a4df1fb4337976a0ee9 SHA-1: 14bcb1bf7fb4bd6d14f73d098674d5218496e900 SHA-256: 38cf52a20cb7f1e30be8309346d8a198d15638764379dd2e9ed4d4f0019cfbf1
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is disguised as an essay on animal testing. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains the redirector URL and references to academic topics, supporting the lure.

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=animal+testing+essay+pdf
    • http://files.lailaspantry.co/uploads/1/3/1/0/131070786/bajalesugifa-padudajuzidodeb.pdf
    • http://files.peakskiacademyparkcity.com/uploads/1/3/1/0/131070327/9834314.pdf
    • http://padexa.sketchytours.com/uploads/1/3/0/7/130739553/2854304.pdf
    • http://files.bboxparties.com/uploads/1/3/1/6/131637631/rerap_pigilozided.pdf
    • http://files.warhawkcatholic.org/uploads/1/3/1/4/131453718/715054.pdf
    • https://cdn.shopify.com/s/files/1/0430/7661/6346/files/vilelofuwekoxat.pdf
    • https://cdn.shopify.com/s/files/1/0430/3706/5370/files/string_theory_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0436/0955/5107/files/trypanosoma_cruzi_diagnostico.pdf
    • https://cdn.shopify.com/s/files/1/0448/2777/1040/files/kuxarikanililodej.pdf
    • https://cdn.shopify.com/s/files/1/0428/3406/7615/files/real_analytic_function.pdf
    • https://cdn.shopify.com/s/files/1/0432/6657/2452/files/74978959354.pdf
    • https://cdn.shopify.com/s/files/1/0429/4161/2199/files/bujetivotefoxojes.pdf
    • https://cdn.shopify.com/s/files/1/0432/6742/4412/files/clickbank_affiliate_marketing.pdf
    • https://cdn.shopify.com/s/files/1/0435/4605/0728/files/52019293160.pdf
    • https://cdn.shopify.com/s/files/1/0430/8946/1410/files/tesunomowex.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_off0000612a.bin
c17c6e9f87c97303305147f9a1e51cb469c908f05ed86ba8805a903f3b4390de
pdf-font-stream PDF embedded font (sfnt) at offset 0x612A 5356 bytes
font_01_sfnt_off00007351.bin
8ff22354b45a701b4bf1b341dc219c46d35ed012c44319f2e2a75053d2973f3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x7351 10504 bytes