Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cf9008a4cdbb09c…

MALICIOUS

PDF

46.7 KB Created: 2020-08-11 09:54:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb3ef5138ff42bbec6b02bb6f0fdb5ff SHA-1: 4c3863618fb8871079df514c58c1844a6d46c091 SHA-256: 8cf9008a4cdbb09ca97d98e5f8f972e92166f6154d1cd06dd9be145ee91b5f98
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.cc/pify?keyword=dire+straits+sultans+of+swing+chords+pdf', leads to known malicious infrastructure. The document also exhibits characteristics of a link farm, with numerous embedded URLs pointing to various PDF files, likely to manipulate search engine results and distribute malicious content.

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=dire+straits+sultans+of+swing+chords+pdf
    • http://nopan.humblepiefarm.com/uploads/1/3/0/8/130814328/539858.pdf
    • http://files.graydensolman.com/uploads/1/3/1/6/131606491/paluzajudiku.pdf
    • http://files.capitalareaanesthia.com/uploads/1/3/1/3/131398561/pibuwowofox.pdf
    • http://nopan.humblepiefarm.com/uploads/1/3/0/8/13
    • https://cdn.shopify.com/s/files/1/0433/6841/5400/files/suboj.pdf
    • https://cdn.shopify.com/s/files/1/0429/8244/1113/files/35795867450.pdf
    • https://cdn.shopify.com/s/files/1/0435/6590/8123/files/dopadekovotatufa.pdf
    • https://cdn.shopify.com/s/files/1/0431/3025/7568/files/php_last_modified_file_in_directory.pdf
    • https://cdn.shopify.com/s/files/1/0438/0485/2386/files/69018547516.pdf
    • https://cdn.shopify.com/s/files/1/0430/4715/7914/files/arkansaw_bear_script.pdf
    • https://cdn.shopify.com/s/files/1/0440/7705/6165/files/pijeterir.pdf
    • https://cdn.shopify.com/s/files/1/0432/0041/3856/files/luwebokipo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0664/7717/files/awakening_the_heroes_within_carol_pearson.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/85986419962.pdf
    • https://cdn.shopify.com/s/files/1/0431/5627/5362/files/55947671069.pdf
    • https://cdn.shopify.com/s/files/1/0429/4233/3091/files/gidirotuwokutuguzufawak.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
font_00_sfnt_off00006716.bin
0d990a5f2627f6af9026a5aa74a52cf4d5fc82e103b3b0fda2b37bf6937f6142		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6716 5392 bytes
font_01_sfnt_off00007975.bin
c84af2db1997a8c492bb59e5af1fb606df13fecc69f947b003c9c431716b9ae6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7975 11488 bytes
font_02_sfnt_off00009f1f.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F1F 4324 bytes

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