Malicious PDF — malware analysis report

Static analysis result for SHA-256 d144cd69df39e798…

MALICIOUS

PDF

36.0 KB Created: 2020-08-26 03:27:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1fdcef5b5ea0cb64034c32798646c242 SHA-1: 40ca2956400a0d2c373aa4fc43558ae2f41c17d0 SHA-256: d144cd69df39e798b59b6a1bbf2810620fb5a80b806c329cfd7797cacfcb3ab2
152 Risk Score

Malware Insights

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

The PDF file was identified as malicious due to the presence of a large number of embedded links, many of which point to a redirector. The primary malicious URL identified is https://ttraff.club/pify?keyword=pokemon+red+ds+rom, which is part of a link farm. The document body contains garbled text but includes the same redirector URL, suggesting it is the intended destination. 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.club/pify?keyword=pokemon+red+ds+rom
    • http://files.saintclementcatholicparish.org/uploads/1/3/1/3/131397940/vomutax.pdf
    • http://gelaje.trec.space/uploads/1/3/1/3/131379945/79f93e0903af.pdf
    • https://cdn.shopify.com/s/files/1/0433/4298/7423/files/8388455297.pdf
    • https://cdn.shopify.com/s/files/1/0431/6895/6565/files/timibebewokidafi.pdf
    • https://cdn.shopify.com/s/files/1/0430/7448/6421/files/basic_english_learning_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/7097/9237/files/5873199749.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/10259518280.pdf
    • https://cdn.shopify.com/s/files/1/0462/1628/2266/files/71218167284.pdf
    • https://cdn.shopify.com/s/files/1/0430/6052/7265/files/exercices_sur_l_article_partitif.pdf
    • https://cdn.shopify.com/s/files/1/0433/4164/3928/files/kingdom_rush_vengeance_level_guide.pdf
    • https://cdn.shopify.com/s/files/1/0428/9878/4422/files/navodaya_admission_form_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/1728/0408/files/tudiromizalopumurutuju.pdf
    • https://cdn.shopify.com/s/files/1/0429/7133/2767/files/65258290387.pdf
    • https://cdn.shopify.com/s/files/1/0429/9456/5271/files/74845783931.pdf
    • https://cdn.shopify.com/s/files/1/0430/5649/6794/files/darexinivizapudi.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_off00004f68.bin
d2c141a0dc01c7f4542c9ec26252e691a5a3518fb64428a1f48d141819b5ad57
pdf-font-stream PDF embedded font (sfnt) at offset 0x4F68 4792 bytes
font_01_sfnt_off00005f9e.bin
c0d9c1ad8ed286745ae778914f527cb0bf1589117939e8d1f52115ca2c1451ef
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F9E 10436 bytes