Malicious PDF — malware analysis report

Static analysis result for SHA-256 d49c12a8506a2147…

MALICIOUS

PDF

40.6 KB Created: 2020-08-21 03:33:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3757646335a733ea44f412114893f15c SHA-1: 41142ec9dfe2a8d652a0ac7f49d3d2b95fc55069 SHA-256: d49c12a8506a2147335a1fc137aa3079f7cfea98d052b8d7fefb44669fa2f648
152 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by an ML classifier and contains a significant number of embedded links. One critical heuristic identified a link to a known malicious redirector infrastructure at 'https://ttraff.com/pify?keyword=afinador+de+guitarra+apk+pro'. Another critical heuristic indicates a PDF link farm, with many links pointing to Shopify domains, likely for SEO spam or to host further malicious content. The document body contains garbled text and a reference to the redirector URL.

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=afinador+de+guitarra+apk+pro
    • http://xalok.buyers-club-solar.com/uploads/1/3/1/4/131437462/3968380.pdf
    • http://tebiton.fbcbelfast.com/uploads/1/3/1/6/131606457/zajenuzif_duvawalixe.pdf
    • http://tepuloj.carolinapca.org/uploads/1/3/1/6/131637316/6381940.pdf
    • http://kitujiluk.childrensbookacademy.com/uploads/1/3/0/8/130874376/vejomunavoro.pdf
    • http://files.coplanvineyards.com/uploads/1/3/1/3/131379118/11f8c24d.pdf
    • https://cdn.shopify.com/s/files/1/0430/2631/7473/files/assessment_in_inclusive_education.pdf
    • https://cdn.shopify.com/s/files/1/0431/8865/0141/files/wogupesudeji.pdf
    • https://cdn.shopify.com/s/files/1/0445/6411/9716/files/bumukarolegurelezesiku.pdf
    • https://cdn.shopify.com/s/files/1/0431/7950/7872/files/35271363261.pdf
    • https://cdn.shopify.com/s/files/1/0427/9074/8316/files/paradise_lost_summary_in_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nisexabidubukov.pdf
    • https://cdn.shopify.com/s/files/1/0437/4921/2309/files/xisagoxuraviw.pdf
    • https://cdn.shopify.com/s/files/1/0430/4610/9345/files/88890258632.pdf
    • https://cdn.shopify.com/s/files/1/0450/6884/5208/files/volume_of_rectangular_prism_with_fractions_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0428/5258/1542/files/a_toned_down_stardew_valley.pdf
    • https://cdn.shopify.com/s/files/1/0437/3138/6529/files/chinese_to_english_translation.pdf
    • https://cdn.shopify.com/s/files/1/0449/0684/0231/files/apache_camel_in_action_free_download.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_off00006367.bin
aee50a1202081d2feb708ce12ba7461926a051ee5c27168f25862543a97733b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6367 5052 bytes
font_01_sfnt_off000074ab.bin
2d80a78990c11abf6e1f01776e8e1793cb86a3e35cb66cd0e7ba1d1b2c0fa640		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74AB 9636 bytes

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