Malicious PDF — malware analysis report

Static analysis result for SHA-256 a556d86a3654ef72…

MALICIOUS

PDF

38.5 KB Created: 2020-08-15 14:36:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 391a00873f6770bb63bf5af083d18eba SHA-1: 9cb31e33925cbedcb7f6e2587407b2dbfbb738fd SHA-256: a556d86a3654ef72af16a6d8653166c926a59b50987eb7a2ff24bb3f4741296a
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including a known malicious redirector at https://ttraff.cc/pify?keyword=alter+ego+plus+3+guide. This suggests the document's primary purpose is to redirect users to malicious infrastructure. The ML classifier strongly supports the malicious verdict.

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=alter+ego+plus+3+guide
    • http://kigaku.askjj.org/uploads/1/3/1/3/131383936/tezapumiti.pdf
    • http://files.eastsidepsychgr.net/uploads/1/3/1/6/131637606/wodonezapaxipa_nevatipitopafu_dalepikakasaxew.pdf
    • https://cdn.shopify.com/s/files/1/0433/3332/0872/files/33717066414.pdf
    • https://cdn.shopify.com/s/files/1/0450/9820/5349/files/all_formulas_used_in_excel.pdf
    • https://cdn.shopify.com/s/files/1/0431/3504/1693/files/pathology_of_tb.pdf
    • https://cdn.shopify.com/s/files/1/0427/8150/7740/files/reset_git_repo.pdf
    • https://cdn.shopify.com/s/files/1/0428/8849/5270/files/91426318504.pdf
    • https://cdn.shopify.com/s/files/1/0430/5158/1591/files/rawuvekipoget.pdf
    • https://cdn.shopify.com/s/files/1/0435/7714/7547/files/inches_ruler_template.pdf
    • https://cdn.shopify.com/s/files/1/0446/6461/9171/files/mint_velvet_leggings_size_guide.pdf
    • https://cdn.shopify.com/s/files/1/0434/5135/1200/files/benign_and_malignant_tumors.pdf
    • https://cdn.shopify.com/s/files/1/0430/2825/0781/files/lopodivegufemuniva.pdf
    • https://cdn.shopify.com/s/files/1/0433/9925/0081/files/antagonista_de_gnrh.pdf
    • https://cdn.shopify.com/s/files/1/0431/2468/7014/files/rae_sremmurd_no_type_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0433/7709/8913/files/john_deere_chainsaw.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_off000050b3.bin
fed2777897d17896ffa973113ec7f0712f9b9170e346a81f87f51939df156743
pdf-font-stream PDF embedded font (sfnt) at offset 0x50B3 5068 bytes
font_01_sfnt_off00006200.bin
5fb12e78c93dca677dc64613dc7ec7bcf3f8c7ae06e4be0d95e508cfef72557f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6200 14412 bytes