Malicious PDF — malware analysis report

Static analysis result for SHA-256 a07632c595aca3ff…

MALICIOUS

PDF

38.5 KB Created: 2020-08-02 06:10:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9689292a8ad0f585c978509728bda28 SHA-1: fd54a4f2938604526889fea4a6f10147a2306bda SHA-256: a07632c595aca3ff418691d8c63ef682e4ead87b105a5f4c84820f501748b5b4
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=mobil+oyun+indir', which is also present in the heuristics. This suggests the primary purpose is to redirect the user to a malicious site, likely for phishing or malware distribution. The ML classifier also strongly flagged this PDF as malicious.

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.cc/pify?keyword=mobil+oyun+indir
    • http://files.communityrocksnd.org/uploads/1/3/1/4/131452952/6ae5c2ae0c049.pdf
    • http://files.seaportquilters.org/uploads/1/3/1/8/131856158/wuzupesot.pdf
    • http://files.ownbeachrentals.com/uploads/1/3/1/4/131407364/4495239.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/7082322425.pdf
    • https://cdn.shopify.com/s/files/1/0437/2257/1930/files/30465435171.pdf
    • https://cdn.shopify.com/s/files/1/0432/2990/5058/files/85767039155.pdf
    • https://cdn.shopify.com/s/files/1/0435/2180/2404/files/javascript_pass_by_reference.pdf
    • https://cdn.shopify.com/s/files/1/0431/9304/1053/files/c_virtual_function.pdf
    • https://cdn.shopify.com/s/files/1/0438/9001/6424/files/befurokop.pdf
    • https://cdn.shopify.com/s/files/1/0438/2959/2214/files/mad_men_musical.pdf
    • https://cdn.shopify.com/s/files/1/0433/0723/7531/files/zadukidujoluwinakuvofofir.pdf
    • https://cdn.shopify.com/s/files/1/0435/3484/4059/files/how_to_delete_a_slack_channel.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_off00004a42.bin
ea87a3ba05e02e1ffb85e4262f94d171dd24954bd7c792d1938e846b3bda63c7
pdf-font-stream PDF embedded font (sfnt) at offset 0x4A42 4364 bytes
font_01_sfnt_off00005901.bin
373baf7c982e7ae4000d9fd607f669e159ecd3efe2a6628b53c72feb8f7a5436
pdf-font-stream PDF embedded font (sfnt) at offset 0x5901 11848 bytes
font_02_sfnt_off00007e3e.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E3E 4324 bytes