Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb86c297e0f683f0…

MALICIOUS

PDF

50.3 KB Created: 2020-08-25 06:48:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f167608d0944d387b73768a2f610b68a SHA-1: 2cef25f8746886cc5ff651ea15cbda6629457a2a SHA-256: eb86c297e0f683f0b8d09ee55c8ebc6e3df9f44357e562967b0b6d400f60117f
152 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to Shopify domains hosting PDF files, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to a known malicious redirector infrastructure at 'https://ttraff.cc/pify?keyword=basic+english+grammar+book+1+pdf'. The document body, though heavily obfuscated, contains text related to 'basic english grammar book 1 pdf', likely intended as a lure. The ML classifier strongly indicated maliciousness.

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=basic+english+grammar+book+1+pdf
    • http://zewire.lamayeshehouse.org/uploads/1/3/1/3/131398020/suruwijakawe.pdf
    • http://files.plbra.org/uploads/1/3/2/7/132710779/poniresokipofade.pdf
    • http://files.cuauhtemocmurphy.com/uploads/1/3/2/8/132815367/9f7c14b.pdf
    • http://files.wrestleatlas.com/uploads/1/3/2/7/132740670/2c15f80d87c.pdf
    • https://cdn.shopify.com/s/files/1/0432/5618/5000/files/50441357530.pdf
    • https://cdn.shopify.com/s/files/1/0431/8317/7887/files/berlin_germany_tourist_information_travel_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/6708/8800/files/42314181161.pdf
    • https://cdn.shopify.com/s/files/1/0435/8724/0093/files/28719395043.pdf
    • https://cdn.shopify.com/s/files/1/0431/7249/5519/files/anamnesis_fisioterapia_formato.pdf
    • https://cdn.shopify.com/s/files/1/0432/1656/8487/files/tiwapomesivunaxitisi.pdf
    • https://cdn.shopify.com/s/files/1/0434/8336/5528/files/balochistan_history_in_urdu.pdf
    • https://cdn.shopify.com/s/files/1/0432/7404/3552/files/minecraft_trigger_command.pdf
    • https://cdn.shopify.com/s/files/1/0434/0023/3110/files/dakuvanunaxel.pdf
    • https://cdn.shopify.com/s/files/1/0429/3237/1622/files/navovifexevezilopavavi.pdf
    • https://cdn.shopify.com/s/files/1/0433/3826/8830/files/41700526598.pdf
    • https://cdn.shopify.com/s/files/1/0437/6713/6407/files/only_input_file.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/semigo.pdf
    • https://cdn.shopify.com/s/files/1/0431/4297/1553/files/dobemogubazazilulabo.pdf
    • https://cdn.shopify.com/s/files/1/0434/4211/0631/files/33236234338.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/
    • https://cdn.shopify.com/s/files/1/0434/4211/0631/files/3323

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007d02.bin
4ce92a73cd63e931c886a30dcc365cb3bcf9c0dbc8973284a9a312117c81befe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D02 5876 bytes
font_01_sfnt_off000090c3.bin
384437f168ad6bdd0fa10fa3d3a53fdf3d1842c8bf07245028dbb0474b6d6977		 pdf-font-stream PDF embedded font (sfnt) at offset 0x90C3 13816 bytes

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