Malicious PDF — malware analysis report

Static analysis result for SHA-256 4377977571efd2e5…

MALICIOUS

PDF

64.4 KB Created: 2020-08-11 15:41:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fbfe8055a20f8d9e06ac9be7fe53a222 SHA-1: 7ca04354df482111d8c3a9110aaa1e99fefec997 SHA-256: 4377977571efd2e5106fb7f744a39841a94865b8480109b7934df58a9d62b09c
152 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The document body contains a URL that points to a redirector, which in turn links to a large number of other PDFs, suggesting a coordinated effort to distribute malicious content or engage in SEO poisoning.

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=makalah+asbabun+nuzul+pdf
    • http://files.courtenaylbc.com/uploads/1/3/1/4/131407233/tovuxisusuxe-xuwew.pdf
    • http://files.webbcityfarmersmarket.com/uploads/1/3/0/7/130738720/f88f82778d6f1.pdf
    • http://files.bassriver-nj.org/uploads/1/3/1/1/131163859/kugoboraxodorerijap.pdf
    • http://files.newcastlenetworkinggroup.com/uploads/1/3/1/6/131606186/3114957.pdf
    • https://cdn.shopify.com/s/files/1/0437/7886/7351/files/79313777647.pdf
    • https://cdn.shopify.com/s/files/1/0429/2296/7207/files/kuwutodek.pdf
    • https://cdn.shopify.com/s/files/1/0430/6203/4589/files/84026268539.pdf
    • https://cdn.shopify.com/s/files/1/0430/8343/2096/files/terafewe.pdf
    • https://cdn.shopify.com/s/files/1/0430/7176/6695/files/21905396398.pdf
    • https://cdn.shopify.com/s/files/1/0432/4828/7904/files/75398626926.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/12410546401.pdf
    • https://cdn.shopify.com/s/files/1/0430/4571/6129/files/tezibigal.pdf
    • https://cdn.shopify.com/s/files/1/0431/2868/4701/files/bovomozomizewuj.pdf
    • https://cdn.shopify.com/s/files/1/0437/8414/3010/files/appsc_group_1_prelims_draft_syllabus_2020.pdf
    • https://cdn.shopify.com/s/files/1/0430/1576/6177/files/livro_de_administrao_financeira_e_oramentria.pdf
    • https://cdn.shopify.com/s/files/1/0432/8354/6267/files/47902281885.pdf
    • https://cdn.shopify.com/s/files/1/0433/7241/3079/files/7th_continent_what_goes_up_rules.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000cc9a.bin
b1a4de4e3d058ce8a34ee929b7da21ed6edcd3230540dc3148af563440b19546		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xCC9A 23136 bytes
font_00_sfnt_off000097ad.bin
8e6f78556e5fe67d343e3fd88caa5fb7b4f35d8c253bb12edc3ebb9cd038549e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97AD 5292 bytes
font_01_sfnt_off0000a9a9.bin
dbc99ae0a41572ed848719a376eedf03a1fa4468a64950d24bcb3fe671e313c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA9A9 10324 bytes

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