Malicious PDF — malware analysis report

Static analysis result for SHA-256 381c99e1726e12fb…

MALICIOUS

PDF

41.7 KB Created: 2020-09-02 18:08:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f09edace0bbd43d127f179aefda57823 SHA-1: d5c1de3eaf62191a8214ecfe9d54d229b8b629b2 SHA-256: 381c99e1726e12fbef6d040b35ba4c3fd34e81cdbda7258f1a67fb0f7199f2b8
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with one pointing to a known malicious redirector (ttraff.com). The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the URL that triggered the heuristic. The primary attack pattern appears to be a link farm or redirector scheme, potentially for SEO manipulation or to lead users to 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.com/wix?keyword=50k+variable+resistor+datasheet
    • https://static.usrfiles.com/ugd/8b49c6_2d72e9c9ac4b4412ab6a20457470adf8.pdf
    • https://static.usrfiles.com/ugd/79e0dc_f24227d4726d4813952ec6ff1ad75366.pdf
    • https://static.usrfiles.com/ugd/6c032c_2c0521a0973b4d94889b74bb6991db40.pdf
    • https://static.usrfiles.com/ugd/8b97dd_4591b491691f417e9eec41cdb97ac3c6.pdf
    • https://static.usrfiles.com/ugd/7041e4_e218f6db314c45638004bd5ee338d84a.pdf
    • https://cdn.shopify.com/s/files/1/0437/5085/0709/files/1556839917.pdf
    • https://cdn.shopify.com/s/files/1/0427/5362/2182/files/73177520278.pdf
    • https://cdn.shopify.com/s/files/1/0434/6013/3031/files/shs_curriculum_guide_organization_and_management.pdf
    • https://cdn.shopify.com/s/files/1/0431/6112/5013/files/tufoserosazepul.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dadimutixiwukigojubiw.pdf
    • https://cdn.shopify.com/s/files/1/0429/9263/1962/files/5058296796.pdf
    • https://cdn.shopify.com/s/files/1/0433/7614/8638/files/saladin_anatomy_and_physiology_lab_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/4365/1741/files/autocad_2010_windows_10_64_bit.pdf
    • https://cdn.shopify.com/s/files/1/0432/0886/8001/files/examples_of_irony_in_literature.pdf
    • https://cdn.shopify.com/s/files/1/0437/2666/7925/files/81296936704.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_off000058d6.bin
58fb2c7221e3ad3ad1575bc6ef5c3d49db1e0e7155d76fc1d8f6c964cd727716		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58D6 5028 bytes
font_01_sfnt_off000069fe.bin
8c5333c2d4ded5c02b4ab815cbabda56dd3159ff9ab84368c5d04d1db0cdfc76		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69FE 9928 bytes
font_02_sfnt_off00008bde.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BDE 4324 bytes

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