Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4df75ce50cf4111…

MALICIOUS

PDF

41.6 KB Created: 2020-09-12 20:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0022a992955195e1d5d1062e28518298 SHA-1: 7cb23b83f7beb3d6750e197d832fae3b10fc54b0 SHA-256: a4df75ce50cf4111caad6338f400956b5d71327070c322acf4ef3e2b5f57d0b8
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though partially corrupted, includes text related to a 'service manual download' and the malicious URL, suggesting a social engineering lure. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be directing users to malicious infrastructure via a deceptive link.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=chevrolet+matiz+service+manual+download
    • http://files.yarmouthportlibrary.org/uploads/1/3/0/7/130776602/wizizomedib-sugodafafu-befakaragev-dikomapevomek.pdf
    • http://begegenu.eestilodevida.com/uploads/1/3/0/9/130969497/lunuzuniziwasata.pdf
    • http://files.huronbirth.com/uploads/1/3/1/0/131070938/59f686c.pdf
    • http://files.andrezsemini.com/uploads/1/3/1/4/131437775/mepedubu_zofad_koguwonapike_felogewotiragaj.pdf
    • http://files.alexislyras.com/uploads/1/3/1/4/131437418/6365201.pdf
    • https://static.usrfiles.com/ugd/384ea4_9d3f9860f2f447bd80d7fecbc73ea1f6.pdf
    • https://static.usrfiles.com/ugd/5f5755_c9fbf6112ff74a22a9bd3ce8bba30ebf.pdf
    • https://static.usrfiles.com/ugd/df73ab_3ddd966e9cfc4958b1167d0e801896c3.pdf
    • https://cdn.shopify.com/s/files/1/0457/9200/2204/files/causative_exercises_rewrite.pdf
    • https://cdn.shopify.com/s/files/1/0428/4969/7959/files/18272595379.pdf
    • https://cdn.shopify.com/s/files/1/0434/1697/7559/files/20367496768.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/47878122177.pdf
    • https://cdn.shopify.com/s/files/1/0484/4440/7976/files/9678422367.pdf
    • https://cdn.shopify.com/s/files/1/0430/2536/7194/files/2100326994.pdf
    • https://cdn.shopify.com/s/files/1/0431/5732/3933/files/95121579245.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_off00006522.bin
1cfdf53febd4c2688b2d918ffcedf94d6f16c666e14d803e81e6dc98556480ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6522 5288 bytes
font_01_sfnt_off000076fe.bin
24dab6d728e8686d0a9107ee2c3a181afc7feb4441ea66f5faf5f0e6a5249177		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76FE 10128 bytes

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