Malicious PDF — malware analysis report

Static analysis result for SHA-256 00a64684bfed48f7…

MALICIOUS

PDF

58.3 KB Created: 2020-08-10 07:50:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f90e6d78607f5ba41a42f998a02c5b07 SHA-1: ca84dcdcfde1662cf17154c7412af14e6832c61a SHA-256: 00a64684bfed48f7ba3b7fdce0d58360567724f6f6f785c7241130aedb4c162d
154 Risk Score

Malware Insights

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

The sample is a PDF file that exhibits characteristics of a link farm, containing numerous external links. One of these links, 'https://ttraff.cc/pify?keyword=anticonvulsant+mechanism+of+action+pdf', points to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious, indicating a high probability of malicious intent.

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=anticonvulsant+mechanism+of+action+pdf
    • http://files.waimayyau.com/uploads/1/3/2/3/132302710/1eb76f4141.pdf
    • http://files.echostage.info/uploads/1/3/1/4/131407164/lobugib_sedekutemi_nibanujaduvabe.pdf
    • http://files.templetonffa.org/uploads/1/3/0/7/130776073/4460813.pdf
    • http://files.gicentralcatholic.org/uploads/1/3/0/7/130775678/majala-lomejamozuzesi-nonisu-radumobewavus.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0448/1895/6448/files/yamaha_ef1000_generator_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/3192/8730/files/74274492740.pdf
    • https://cdn.shopify.com/s/files/1/0437/6713/6413/files/84431792635.pdf
    • https://cdn.shopify.com/s/files/1/0428/6647/5164/files/regagugubu.pdf
    • https://cdn.shopify.com/s/files/1/0436/9619/3686/files/bacillus_species_characteristics.pdf
    • https://cdn.shopify.com/s/files/1/0438/3703/0560/files/adverbs_definition_and_examples.pdf
    • https://cdn.shopify.com/s/files/1/0429/1526/6713/files/desepeloj.pdf
    • https://cdn.shopify.com/s/files/1/0427/4244/8295/files/embrace_of_the_vampire_2013.pdf
    • https://cdn.shopify.com/s/files/1/0430/3932/6365/files/94197544546.pdf
    • https://cdn.shopify.com/s/files/1/0432/5369/4626/files/the_tournament_at_gorlan.pdf
    • https://cdn.shopify.com/s/files/1/0431/4152/9762/files/b._sc_maths_solution.pdf
    • https://cdn.shopify.com/s/files/1/0432/2797/1741/files/amaurose_congenita_de_leber.pdf
    • https://cdn.shopify.com/s/files/1/0448/2557/5581/files/8681588409.pdf
    • https://cdn.shopify.com/s/files/1/0431/4100/5480/files/pibagenon.pdf
    • https://cdn.shopify.com/s/files/1/0431/5657/0266/files/xiwen.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a664.bin
a8388b0732a72893101f8cc7df51f71804c074f55afacc206cdfc4d387426a04		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA664 5348 bytes
font_01_sfnt_off0000b87f.bin
ece427b1b5ab280a5232aa2079fb274898f2fffdbc7900bd3fb54da08448b107		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB87F 10292 bytes

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