Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d916f09fa7393d0…

MALICIOUS

PDF

45.4 KB Created: 2020-08-28 10:16:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d44498665fe3d118de9bf93dc8b471a SHA-1: 22299ec98c74c30326215aefc5ef3ef56297a4e8 SHA-256: 9d916f09fa7393d02a4433f7df2022974bc83499fc56dc3902394a36f819359b
152 Risk Score

Malware Insights

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

The PDF was flagged by a critical heuristic for linking to a known malicious redirector and for containing a large number of external PDF links, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly indicated maliciousness. The primary malicious IOC is the redirector URL, which likely leads to further malicious content or phishing pages.

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=nomes+de+vegetais+em+ingles+e+seu+pr
    • http://pegin.darebritannia.com/uploads/1/3/1/1/131164250/vosafi-doditotajo-luzipizugux.pdf
    • http://gunulako.evermorlabradors.com/uploads/1/3/0/8/130813528/bazeso.pdf
    • http://bofatifi.guerrillazoo.com/uploads/1/3/1/6/131607029/dilitizuvamikuzu.pdf
    • https://cdn.shopify.com/s/files/1/0434/1691/2037/files/nazijutitawemoxapobasagi.pdf
    • https://cdn.shopify.com/s/files/1/0449/5589/3928/files/embedded_c_objective_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0440/8731/2536/files/campephilus_imperialis.pdf
    • https://cdn.shopify.com/s/files/1/0431/7400/2848/files/72782389725.pdf
    • https://cdn.shopify.com/s/files/1/0432/8184/2341/files/numutatojer.pdf
    • https://cdn.shopify.com/s/files/1/0430/5358/0439/files/12709008351.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0241/files/90404960992.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/98629167596.pdf
    • https://cdn.shopify.com/s/files/1/0437/3898/8709/files/emerson_32_inch_tv_manual.pdf
    • https://cdn.shopify.com/s/files/1/0436/1102/9667/files/kazoo_kid_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0431/9812/0094/files/1496208717.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_off00006e42.bin
740ee6d30b4ee346e4f716736752754996661b35ca6958795fb46eb69f0b3b38
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E42 5308 bytes
font_01_sfnt_off00008044.bin
f037b193dc02dc902d2865b7fd8e67be76a1c725ce15fe167744486942457870
pdf-font-stream PDF embedded font (sfnt) at offset 0x8044 12896 bytes