Malicious PDF — malware analysis report

Static analysis result for SHA-256 df186d463007e122…

MALICIOUS

PDF

68.3 KB Created: 2020-08-08 09:24:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d703aaa1a287a3a2944b22a0dac9820d SHA-1: 5feb14f91fc16fb6ae1e12f77e3483d1c4b1bbcb SHA-256: df186d463007e122654b27aa6f26e324bfcf60e3c0c08b108790db5c39565b5d
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, identified as a link farm, with a critical heuristic firing for a malicious redirector. The document body, though partially garbled, contains the URL https://ttraff.com/wb?keyword=dunlop%20belt%20conveyor%20design%20manual, which is flagged as malicious. The ML classifier also strongly indicated maliciousness.

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/wb?keyword=dunlop%20belt%20conveyor%20design%20manual
    • http://files.wildwholeandhealthy.com/uploads/1/3/0/7/130738836/mebuwewabutuliz.pdf
    • http://files.kgdtranslation.com/uploads/1/3/0/9/130969498/gerupijaje_jipotojunuguda.pdf
    • http://fipuraref.glenfieldmethodistchurch.org/uploads/1/3/0/8/130874493/tuzeruxevevebelade.pdf
    • http://files.countryhides.com/uploads/1/3/0/7/130739024/2a98ea.pdf
    • https://cdn.shopify.com/s/files/1/0428/7909/0854/files/accounts_format.pdf
    • https://cdn.shopify.com/s/files/1/0438/4469/8272/files/dysfunctional_uterine_bleeding_2020.pdf
    • https://cdn.shopify.com/s/files/1/0437/8938/5888/files/46790891678.pdf
    • https://cdn.shopify.com/s/files/1/0433/5196/5855/files/zezavugefalibisox.pdf
    • https://cdn.shopify.com/s/files/1/0439/6033/6542/files/dokepufuka.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wesuwalaloluxafim.pdf
    • https://cdn.shopify.com/s/files/1/0435/6653/0728/files/3959942744.pdf
    • https://cdn.shopify.com/s/files/1/0431/0702/5056/files/55872951970.pdf
    • https://cdn.shopify.com/s/files/1/0434/2602/1527/files/31270682073.pdf
    • https://cdn.shopify.com/s/files/1/0437/1510/0840/files/adobe_acrobat_standard_2020_flatten.pdf
    • https://cdn.shopify.com/s/files/1/0432/0968/7208/files/31709739247.pdf
    • https://cdn.shopify.com/s/files/1/0431/6325/4944/files/98735164152.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_off0000c15c.bin
0619f919076ac20624c035b3898ab9524a930d14a33bf4a80202a6529ba37609
pdf-font-stream PDF embedded font (sfnt) at offset 0xC15C 5696 bytes
font_01_sfnt_off0000d4af.bin
a19eee39ff571d55e682a4ea5df313b33d116d36dcc23920a4789e2c7d7af208
pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AF 15520 bytes