Malicious PDF — malware analysis report

Static analysis result for SHA-256 86eb768f108dd9bb…

MALICIOUS

PDF

38.7 KB Created: 2020-07-31 07:29:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31f88f885557c0f57b90cc84d7ba100c SHA-1: 609df616c716915438396746c49d298854060e65 SHA-256: 86eb768f108dd9bb5bb30d7c385a71e88ffc816b41d4a0b8a526e879df38bb6c
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many of which point to a redirector service (ttraff.cc). The document body, though heavily obfuscated, appears to be a lure for a sales book download. The ML classifier strongly indicates maliciousness, and the heuristic firings confirm the presence of malicious redirector links and a link farm.

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=a+b%25C3%25ADblia+de+vendas+jeffrey+gitomer+download+pdf
    • http://files.catryanmedium.com/uploads/1/3/2/6/132695636/kubotaxowiwi_jukizowarim_timoxob.pdf
    • http://files.yesandventure.com/uploads/1/3/1/4/131452883/najuzonuxu.pdf
    • http://files.vegetarianproteinlist.com/uploads/1/3/1/3/131381464/vulanunidodasev.pdf
    • http://files.amishpoly.com/uploads/1/3/0/7/130739991/5c804fe019443.pdf
    • https://cdn.shopify.com/s/files/1/0428/3029/9292/files/vijowinil.pdf
    • https://cdn.shopify.com/s/files/1/0431/7193/8453/files/75550287247.pdf
    • https://cdn.shopify.com/s/files/1/0436/6322/9078/files/mipunoburemivenirabezi.pdf
    • https://cdn.shopify.com/s/files/1/0428/2328/6940/files/jajofudebodov.pdf
    • http://files.laneedasupherb.square.site/uploads/1/3/0/7/130775528/6594899.pdf
    • https://cdn.shopify.com/s/files/1/0429/8581/6218/files/96501037816.pdf
    • https://cdn.shopify.com/s/files/1/0431/4077/6093/files/64639776913.pdf
    • https://cdn.shopify.com/s/files/1/0428/2338/5247/files/purov.pdf
    • https://cdn.shopify.com/s/files/1/0430/6265/7177/files/vufetapezabunatetalol.pdf
    • https://cdn.shopify.com/s/files/1/0436/3298/4222/files/rawese.pdf
    • https://cdn.shopify.com/s/files/1/0431/8589/7627/files/96970211214.pdf
    • https://cdn.shopify.com/s/files/1/0430/4083/3690/files/80712976247.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/
    • https://cdn.shopify.com/s/files/1/0436

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000055fc.bin
ff13ddfae40959035f58b93ca42698bbf9429c2e3117d10275910f39a0f1926d
pdf-font-stream PDF embedded font (sfnt) at offset 0x55FC 5660 bytes
font_01_sfnt_off00006938.bin
388d1fe8df3e4873073358b5e190a72c8fa2c11f9775a4683730a98326597ecd
pdf-font-stream PDF embedded font (sfnt) at offset 0x6938 9972 bytes