Malicious PDF — malware analysis report

Static analysis result for SHA-256 d109e6425b3b8bd3…

MALICIOUS

PDF

41.1 KB Created: 2020-08-06 11:47:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0853623b74075afb41b2f251ebbc87ae SHA-1: d6bbdbd08a2d523cb1fd66ac720aa341440402b9 SHA-256: d109e6425b3b8bd344d88ffbc6813653acfc771f0a5643c689472996059663f1
152 Risk Score

Malware Insights

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

The PDF document was flagged by a critical heuristic for linking to known malicious redirector infrastructure. It also contains a link farm with numerous external PDF links, many hosted on Shopify. The embedded URLs and the ML classifier strongly indicate malicious intent, likely to lure users to malicious sites. No scripts were extracted from this sample.

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.com/pify?keyword=tipos+de+vinhos+pdf
    • http://fezope.rimbeyvictimservices.com/uploads/1/3/1/4/131453870/048f1f23eac27c2.pdf
    • http://kutoweb.dwellwithchrist.com/uploads/1/3/1/0/131070487/3cdc4e106.pdf
    • http://vegimozi.induologue.com/uploads/1/3/0/8/130874254/dalekutuvema.pdf
    • https://cdn.shopify.com/s/files/1/0431/3733/5464/files/9064920022.pdf
    • https://cdn.shopify.com/s/files/1/0439/4654/1211/files/noxovepefupepigigawak.pdf
    • https://cdn.shopify.com/s/files/1/0431/1131/7658/files/37751601138.pdf
    • https://cdn.shopify.com/s/files/1/0449/7352/3112/files/vocabulary_words_for_ssc.pdf
    • https://cdn.shopify.com/s/files/1/0430/5652/9565/files/futewiduzevonuxilak.pdf
    • https://cdn.shopify.com/s/files/1/0431/8239/1451/files/vanedutod.pdf
    • https://cdn.shopify.com/s/files/1/0430/4420/8789/files/bikobepoximo.pdf
    • https://cdn.shopify.com/s/files/1/0440/7577/8198/files/ai_dungeon_2_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/1324/9946/files/concat_dataframe_pandas.pdf
    • https://cdn.shopify.com/s/files/1/0434/3519/6566/files/wapawidexumurezegaxos.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_off00006050.bin
1e9fd2aa8ebd9fbb9d78b117a3567b558b9f0b6e9ad8066d790c512ed0a4cef7
pdf-font-stream PDF embedded font (sfnt) at offset 0x6050 4800 bytes
font_01_sfnt_off000070b0.bin
e3832c93ba048ab2162931e60c00287e456392ddcfc2a36aa600bfb430321d0d
pdf-font-stream PDF embedded font (sfnt) at offset 0x70B0 12512 bytes