Malicious PDF — malware analysis report

Static analysis result for SHA-256 914547813fbddb96…

MALICIOUS

PDF

42.1 KB Created: 2020-08-08 19:23:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f0f7c8d52ad41100fc2a970b35332bf7 SHA-1: 1ef6f6d26df2f149d036d08aa93ebd5b70d8a4e7 SHA-256: 914547813fbddb9600a3be035e8fdd1dce6ec9ba5622d583df6420021a0453e9
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, many of which point to a link farm hosted on Shopify. One of these links, https://ttraff.cc/wb?keyword=laser%20printer%20technology%20pdf, is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to the same URL, suggesting the primary intent is to redirect the user to malicious infrastructure.

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/wb?keyword=laser%20printer%20technology%20pdf
    • http://files.freshburies.com/uploads/1/3/1/3/131384470/mirosi.pdf
    • http://rinemun.whiteevolution.org/uploads/1/3/0/7/130739553/mufutivenu.pdf
    • http://files.costellohsie.info/uploads/1/3/0/7/130738748/5edd2f7.pdf
    • https://cdn.shopify.com/s/files/1/0431/5296/5792/files/wodakajamewazezedupabebox.pdf
    • https://cdn.shopify.com/s/files/1/0431/4896/8100/files/gulofizizagatukejuvage.pdf
    • https://cdn.shopify.com/s/files/1/0431/5083/5876/files/gatumadovaridu.pdf
    • https://cdn.shopify.com/s/files/1/0449/5409/1675/files/c_csv_writer.pdf
    • https://cdn.shopify.com/s/files/1/0433/5045/8520/files/65535746869.pdf
    • https://cdn.shopify.com/s/files/1/0432/6552/3870/files/vugidejepogilorij.pdf
    • https://cdn.shopify.com/s/files/1/0432/2679/2093/files/72230016638.pdf
    • https://cdn.shopify.com/s/files/1/0432/7807/4020/files/47034461787.pdf
    • https://cdn.shopify.com/s/files/1/0435/5247/3252/files/primary_auxiliary_verbs_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0435/7426/3963/files/wejikufigapetomubawuwux.pdf
    • https://cdn.shopify.com/s/files/1/0430/0223/2983/files/68532956132.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_off00006717.bin
a09b954f019efa8392985bddbc805371ca80a4afb4d334be3847d948aaaf05c9
pdf-font-stream PDF embedded font (sfnt) at offset 0x6717 5460 bytes
font_01_sfnt_off000079b0.bin
d3fd94499430a800115d4dda6c435b0f7e8144777f49b52a23b70b181e65de2c
pdf-font-stream PDF embedded font (sfnt) at offset 0x79B0 10008 bytes