Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d4bbf82eedb8575…

MALICIOUS

PDF

42.9 KB Created: 2020-08-16 21:11:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ebf176eab08a593f30f18ade4b3493b8 SHA-1: e75a96d39ca7caa7b495b3406f17ffd5abe7858d SHA-256: 1d4bbf82eedb8575f6f1437c7a35977ad2e05bd0a766e167890ffe5868f84164
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, identified as a link farm. One of these links, 'https://ttraff.ru/pify?keyword=camera+360++for+mobile', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. This suggests the document's primary purpose is to lure users to malicious sites, likely for phishing or malware delivery.

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.ru/pify?keyword=camera+360++for+mobile
    • http://bakotagag.babasvegancafe.com/uploads/1/3/1/4/131406069/4614727.pdf
    • http://kuxoz.ayeeprettyblack.com/uploads/1/3/1/4/131453247/xutiwolan-sarebitimap-nibirev-demud.pdf
    • https://cdn.shopify.com/s/files/1/0436/3547/4590/files/38330894737.pdf
    • https://cdn.shopify.com/s/files/1/0436/3298/4222/files/28065463153.pdf
    • https://cdn.shopify.com/s/files/1/0430/0649/2823/files/pros_and_cons_of_plastic_surgery.pdf
    • https://cdn.shopify.com/s/files/1/0429/1988/7001/files/waveso.pdf
    • https://cdn.shopify.com/s/files/1/0435/2252/3288/files/tepeso.pdf
    • https://cdn.shopify.com/s/files/1/0431/2819/3186/files/bakamitilifeta.pdf
    • https://cdn.shopify.com/s/files/1/0433/4393/7690/files/fexoxid.pdf
    • https://cdn.shopify.com/s/files/1/0437/5032/6426/files/bhaijaan_bengali_movie_video_songs.pdf
    • https://cdn.shopify.com/s/files/1/0437/2814/2501/files/wamumuzujovevibege.pdf
    • https://cdn.shopify.com/s/files/1/0437/3151/7605/files/45003429120.pdf
    • https://cdn.shopify.com/s/files/1/0431/4677/2629/files/60915204538.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_off00006a55.bin
cb136a58ea44e84b7372d8edbf6f12cc4b41eb00db7284e6c80183c9cdd1b763
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A55 5240 bytes
font_01_sfnt_off00007c0a.bin
79e5430fb5c09b025754ff839be9dbec13ef2190e358c465d08ad90daf4101f8
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C0A 10376 bytes