Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c7b5ba508e003c7…

MALICIOUS

PDF

46.6 KB Created: 2020-09-05 03:38:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0fa1a38e9043eec9d73738bc7cc136fe SHA-1: 55afaaa4778bf4f024a20fb3cd49196328f0d573 SHA-256: 3c7b5ba508e003c738e577bda9ffee1d36ae1c129fde3581b02de95a12fc31a2
152 Risk Score

Malware Insights

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

The PDF contains a prominent link disguised as a troubleshooting guide for a common technical issue, aiming to trick the user into clicking it. The link leads to a known malicious redirector. The ML classifier strongly indicated maliciousness, and the PDF structure includes a large number of external links, characteristic of SEO spam or link farms used for distribution.

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.link/wix?keyword=acer+android+tablet+wont+connect+to+wifi
    • https://static.usrfiles.com/ugd/9b5f63_8ad31f76fb6b43e49fa6f44b10666cb4.pdf
    • https://static.usrfiles.com/ugd/3649d2_53bab172dd674c34b60ff321bd69dbb6.pdf
    • https://static.usrfiles.com/ugd/b8c837_c006eff4af144b62b554a8e6e65f7e1c.pdf
    • https://static.usrfiles.com/ugd/fedf23_4ef5ed0a973844e2b087e300955536a1.pdf
    • https://static.usrfiles.com/ugd/d1fcfc_6b16a2f9324f4430ba38898fd64a277f.pdf
    • https://static.usrfiles.com/ugd/e745be_e6a1753bab844054ae5a09ca1f50d720.pdf
    • https://static.usrfiles.com/ugd/d55797_15b4a962d36441f093feb754297dcae9.pdf
    • https://static.usrfiles.com/ugd/74a852_e99864830b2c4b8da0eca20c27edd747.pdf
    • https://static.usrfiles.com/ugd/2ca09c_b3410112310045d5b282bab54d130eea.pdf
    • https://static.usrfiles.com/ugd/b8c837_a153936927df48dbbdf7ad9dd26bfb88.pdf
    • https://static.usrfiles.com/ugd/003b86_152c6553644f490291fcfb45e0e8d196.pdf
    • https://static.usrfiles.com/ugd/28146e_76243356dc554f21928c5a058b5ac0af.pdf
    • https://cdn.shopify.com/s/files/1/0429/7388/8671/files/35963907620.pdf
    • https://cdn.shopify.com/s/files/1/0428/8148/2919/files/osmosis_and_osmotic_pressure.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3087/files/78673894659.pdf
    • https://cdn.shopify.com/s/files/1/0432/4950/0315/files/93632131326.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_off00007825.bin
63580a77574ca3363be045f6d8c7c75e95f12703dd46c7eb9853e6a62ab99648
pdf-font-stream PDF embedded font (sfnt) at offset 0x7825 5060 bytes
font_01_sfnt_off0000897e.bin
a778d7ecfc2a1aee6b3e25e5ae196a28cf3ae6ae1744593ad5ed94cca7ec9b34
pdf-font-stream PDF embedded font (sfnt) at offset 0x897E 10460 bytes