Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5351d546bde5f72…

MALICIOUS

PDF

46.3 KB Created: 2020-09-02 03:30:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d314218fb232310cc38a419fecdc54b3 SHA-1: 7e12e6dc68f96a9ebb6b60c5bcae43cd899f761c SHA-256: c5351d546bde5f72537b082473de35c99bc2cf07285a1ec2cf8cacfb37b81fdc
152 Risk Score

Malware Insights

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

The PDF file contains embedded links that point to a known malicious redirector. The document body, though partially corrupted, suggests it is disguised as a technical specification sheet for an 'Xlerator hand dryer'. The primary malicious URL identified is https://ttraff.club/wix?keyword=xlerator+hand+dryer+spec+sheet, which is flagged as a malicious redirector. 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.club/wix?keyword=xlerator+hand+dryer+spec+sheet
    • https://static.usrfiles.com/ugd/33a16d_6ce88f97c97e46349eb68d1ba2bb57ed.pdf
    • https://static.usrfiles.com/ugd/b50c55_5b7951bfbe394249b880166afdc44d9b.pdf
    • https://static.usrfiles.com/ugd/93971e_805588f2d79c4ca3904f91eeec4942e0.pdf
    • https://cdn.shopify.com/s/files/1/0428/0041/4883/files/fowulolixifuzipejisi.pdf
    • https://cdn.shopify.com/s/files/1/0457/6405/1100/files/autoimmunity_nptel.pdf
    • https://cdn.shopify.com/s/files/1/0431/8307/9588/files/49222486537.pdf
    • https://cdn.shopify.com/s/files/1/0432/6562/2184/files/consortium_vs_joint_venture.pdf
    • https://cdn.shopify.com/s/files/1/0437/2417/7576/files/4949286043.pdf
    • https://cdn.shopify.com/s/files/1/0434/3247/6838/files/clinical_pharmacy_and_therapeutics_5th_edition_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/3464/7451/files/lowabebidapiwej.pdf
    • https://cdn.shopify.com/s/files/1/0431/2514/5760/files/83273441923.pdf
    • https://cdn.shopify.com/s/files/1/0433/6805/4949/files/32565168402.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_off00006d84.bin
0dd7260a09e4c70bc5baa0e3b4108d3d746a7e5f539bd345657ab952a1ea64b1
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D84 5240 bytes
font_01_sfnt_off00007f52.bin
59b6538660805832ff2e932baad86f525c23d7e5916927a9bc0a8085f7f83fd8
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F52 14000 bytes