Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e31ef129f3dbe4e…

MALICIOUS

PDF

60.2 KB Created: 2020-08-13 05:04:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1022b85944465bbdbfa9435b48e3d727 SHA-1: 62d56fcb2cf55870abf9a9510f4d2e163c0b61fb SHA-256: 2e31ef129f3dbe4ef847e9c3125a15f1520c73ae5b36eff41497c5edb38449b7
152 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically pointing to a known malicious redirector at 'ttraff.com'. This redirector is used in conjunction with a lure related to 'cardiac arrhythmia ecg pdf'. The PDF also hosts a large number of other PDFs on Shopify domains, suggesting a link farm or content stuffing technique to improve search engine visibility for malicious content. The ML classifier 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.com/pify?keyword=cardiac+arrhythmia+ecg+pdf
    • http://files.myequinesolutions.com/uploads/1/3/1/6/131606261/8298384.pdf
    • http://files.bubbleytrinkets.com/uploads/1/3/0/9/130969306/8825683.pdf
    • http://files.myececlass-growth.com/uploads/1/3/0/7/130740464/zojejava_dupareja.pdf
    • http://files.mcrudin.com/uploads/1/3/1/0/131071164/9951448.pdf
    • https://cdn.shopify.com/s/files/1/0432/2571/0752/files/wuluripopuwepasiwelax.pdf
    • https://cdn.shopify.com/s/files/1/0431/6643/3435/files/nojigawaziwimoxese.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/91025233068.pdf
    • https://cdn.shopify.com/s/files/1/0437/6068/1111/files/guild_wars_2_world_boss_timer.pdf
    • https://cdn.shopify.com/s/files/1/0430/5806/9655/files/26301234470.pdf
    • https://cdn.shopify.com/s/files/1/0432/0709/8529/files/85654055067.pdf
    • https://cdn.shopify.com/s/files/1/0429/1582/3772/files/65099920201.pdf
    • https://cdn.shopify.com/s/files/1/0437/6936/4631/files/apocryphe_de_jean.pdf
    • https://cdn.shopify.com/s/files/1/0432/5018/8443/files/vimurose.pdf
    • https://cdn.shopify.com/s/files/1/0432/8862/5316/files/meaning_of_tax_administration.pdf
    • https://cdn.shopify.com/s/files/1/0435/0276/4192/files/adding_and_subtracting_fractions_worksheets_with_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0433/9869/3022/files/jiped.pdf
    • https://cdn.shopify.com/s/files/1/0434/0760/5923/files/bimuduruxipadebumipiz.pdf
    • https://cdn.shopify.com/s/files/1/0432/5618/5000/files/1519928157.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_off0000adca.bin
84ca26e3e6102a8d2cf4bef682d9ec5f1f03ece353acbab215c18976879b643e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xADCA 5364 bytes
font_01_sfnt_off0000bff7.bin
3c3bf19a348a94cd85c5778db9ed0d2654e7316e69f08d1409c8a50c2c9741f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBFF7 10404 bytes

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