Malicious PDF — malware analysis report

Static analysis result for SHA-256 43868bbe6ae4a497…

MALICIOUS

PDF

42.9 KB Created: 2020-08-09 13:14:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 325369927489b1aadb260361b8a848cd SHA-1: 2bec3152ccd00be0a58b8236786590a06f5874cf SHA-256: 43868bbe6ae4a497db11cd69d021d62c91e36d7b486bc61e42e31e4056031c77
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.cc'. This URL is embedded within the document body, disguised as a link to a Swedish language book PDF. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The primary attack vector appears to be social engineering via a deceptive link.

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=learning+swedish+language+books+pdf
    • http://files.sarahpoulgrain.com/uploads/1/3/2/7/132740978/8bb4e13.pdf
    • http://files.whitesschoolfordogs.com/uploads/1/3/0/8/130873945/7359147.pdf
    • http://files.geraldinepilgrim.com/uploads/1/3/2/8/132815346/6780435.pdf
    • http://files.ucfilter.com/uploads/1/3/0/7/130740465/pamobobewube.pdf
    • http://files.heatherseagraves.com/uploads/1/3/2/3/132302774/nufigidoruz-reverime-mojavo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/volobufepafolosovi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9308/2783/files/ggplot_rotate_axis_labels.pdf
    • https://cdn.shopify.com/s/files/1/0433/8502/8758/files/kubejunikijasokofiwuku.pdf
    • https://cdn.shopify.com/s/files/1/0438/3503/1712/files/55442952561.pdf
    • https://cdn.shopify.com/s/files/1/0437/9541/5189/files/sodinugusosufov.pdf
    • https://cdn.shopify.com/s/files/1/0431/1459/4466/files/79849063451.pdf
    • https://cdn.shopify.com/s/files/1/0433/7090/5756/files/mount_and_blade_warband_napoleonic_mod.pdf
    • https://cdn.shopify.com/s/files/1/0429/8162/1919/files/zexuravumu.pdf
    • https://cdn.shopify.com/s/files/1/0434/9768/5157/files/xitibijijizawolidawagakad.pdf
    • https://cdn.shopify.com/s/files/1/0433/4875/4581/files/lakirebikowutadodamabedij.pdf
    • https://cdn.shopify.com/s/files/1/0431/9540/0356/files/19106939657.pdf
    • https://cdn.shopify.com/s/files/1/0429/9823/5289/files/family_guy_jackass.pdf
    • https://cdn.shopify.com/s/files/1/0432/0329/7438/files/14649136309.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_off0000691a.bin
d9f2a0b0a02213fcfb97663df890bf99d9627ccb5208f628c31fa30977b24c5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x691A 5540 bytes
font_01_sfnt_off00007bfb.bin
98c594d04ff163ebc2fda4e0468e61337e5539b9407b22a8cc59ff85417427f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BFB 10128 bytes

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