Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c51ce4c1d67c2a0…

MALICIOUS

PDF

47.1 KB Created: 2020-08-21 07:24:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b60d1cfda75c713b0b6a69e31283f2e8 SHA-1: 570e12d33ad4506251968bf592bafd1d7fb82852 SHA-256: 0c51ce4c1d67c2a0b04b4ea5f5a589226415504f24b625f391a856e99de174e2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same malicious URL and several benign-looking Shopify URLs, suggesting a link farm or SEO poisoning tactic to drive traffic to malicious sites.

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=flight+of+the+bumblebee+sheet+music+clarinet
    • http://files.clintoncemetery.org/uploads/1/3/1/3/131380625/vufuxowuxokiwa-nowebuvemox-jawaza-rabidekiz.pdf
    • http://sedijog.scorpiontv.us/uploads/1/3/0/7/130775422/bababinuzi.pdf
    • http://files.thissiteisunderconstruction.org/uploads/1/3/2/6/132682542/besozig_binuvidudenu.pdf
    • http://lamaxi.wrangellsda.org/uploads/1/3/2/6/132683292/81d2d854a87886f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/8235/7663/files/pepidar.pdf
    • https://cdn.shopify.com/s/files/1/0431/3156/8290/files/loxuledumir.pdf
    • https://cdn.shopify.com/s/files/1/0428/1804/4063/files/femaferimezarezisazol.pdf
    • https://cdn.shopify.com/s/files/1/0449/5346/9083/files/map_of_benue_state.pdf
    • https://cdn.shopify.com/s/files/1/0435/2190/0696/files/24699860174.pdf
    • https://cdn.shopify.com/s/files/1/0439/3975/8235/files/zirezawexilumero.pdf
    • https://cdn.shopify.com/s/files/1/0439/0351/6824/files/52879827913.pdf
    • https://cdn.shopify.com/s/files/1/0428/7394/6275/files/ratetutalajopexitaxipe.pdf
    • https://cdn.shopify.com/s/files/1/0433/7831/1326/files/remove_duplicates_from_list_python.pdf
    • https://cdn.shopify.com/s/files/1/0431/9382/7485/files/7818615649.pdf
    • https://cdn.shopify.com/s/files/1/0431/1734/6965/files/bless_the_lord_guitar_chords.pdf
    • https://cdn.shopify.com/s/files/1/0436/5749/4693/files/lil_wayne_something_you_forgot.pdf
    • https://cdn.shopify.com/s/files/1/0434/8523/3304/files/zapelakeboxarojasakemofa.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000636d.bin
edb1a16b1ff6cdcbbc427158606646115c5fc8b57e8c1802cfb7a514a6afda87		 pdf-font-stream PDF embedded font (sfnt) at offset 0x636D 5392 bytes
font_01_sfnt_off000075a8.bin
3d59353c3ddfbbeff41950012e7ff7b87a2ded23e2215d1bf7abba955c40e2f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75A8 10536 bytes
font_02_sfnt_off000099da.bin
b330339415d7fa9c1b652c1fb2a052ec06569061b7b71506ab53161dc9b94742		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99DA 16100 bytes

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