Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdc8bfb680ae3017…

MALICIOUS

PDF

44.1 KB Created: 2020-08-24 03:02:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c928926ad972a53727ab1f445339e67c SHA-1: 46ebc0da8a7bdd6eca3a8c56d89cb2c6557594e7 SHA-256: bdc8bfb680ae3017a868733ac1b403739ccd71a2ee1b7e296ec3fbee0b48e05d
152 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier as malicious and contains a critical link to a known malicious redirector. Additionally, it exhibits characteristics of a PDF link farm, with many embedded URLs pointing to external PDF files, likely for SEO manipulation or to distribute further malicious content. The document body contains a URL that appears to be part of the redirection chain.

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=lagu+alan+walker+ignite+ft+seungri
    • http://files.klacapital.com/uploads/1/3/1/4/131406173/d75f598.pdf
    • http://files.lynnobrienmusic.com/uploads/1/3/1/8/131871717/viwojajixaxive.pdf
    • http://xamebaj.stannard.co.nz/uploads/1/3/0/7/130776525/5f38b3187.pdf
    • http://valalor.granvillegaps.org/uploads/1/3/2/7/132740805/kenamov.pdf
    • http://gejesa.hannahschenk.com/uploads/1/3/1/8/131857252/0b8ecc.pdf
    • https://cdn.shopify.com/s/files/1/0437/3469/6097/files/pebevixifojilefamewibu.pdf
    • https://cdn.shopify.com/s/files/1/0440/5559/3110/files/sogotijomage.pdf
    • https://cdn.shopify.com/s/files/1/0451/3798/5690/files/cancer_de_mama_inflamatrio.pdf
    • https://cdn.shopify.com/s/files/1/0437/8863/2213/files/begetipozofemevabiz.pdf
    • https://cdn.shopify.com/s/files/1/0437/5894/4405/files/suxinajigigalidabine.pdf
    • https://cdn.shopify.com/s/files/1/0440/8328/2070/files/undercover_economist.pdf
    • https://cdn.shopify.com/s/files/1/0427/6004/4710/files/38113573402.pdf
    • https://cdn.shopify.com/s/files/1/0431/2317/9677/files/fesuzumuvulux.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_off00005a79.bin
3822c9a6099215722b25a1ecd531463bcf2da58e9e04f2086b694eca664fbf33
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A79 5032 bytes
font_01_sfnt_off00006bc4.bin
7239cfbc60bd25b4cb7ad7894507ea6bc707df4a1876efad443bac11a5e809ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x6BC4 9856 bytes
font_02_sfnt_off00008dc8.bin
a109d5cc1a8599929bd7702a943337bd153faf2776ff4e30ac39a15e38c17cef
pdf-font-stream PDF embedded font (sfnt) at offset 0x8DC8 16204 bytes