Malicious PDF — malware analysis report

Static analysis result for SHA-256 98fc5a746b58bc4c…

MALICIOUS

PDF

42.6 KB Created: 2020-08-06 07:01:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e7560c0f6049af7ce92018c2e95ddc1a SHA-1: 5b204f46bb6afec63bffa24f0caa67bddcf2435d SHA-256: 98fc5a746b58bc4c747cd17eb2c1d677f35268df5eaa883666ce83bf3de385ca
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external PDF files, indicative of a link farm or SEO manipulation tactic. One of these links, https://ttraff.com/pify?keyword=metaphysical+poets+by+ts+eliot+pdf, is identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious, supporting the presence of malicious content.

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=metaphysical+poets+by+ts+eliot+pdf
    • http://files.dahnmonwhittfamily.com/uploads/1/3/1/1/131164100/wubufilosim_wisexolasepig_fodig.pdf
    • http://files.koolcompanies.com/uploads/1/3/1/6/131606128/tivotamokuwivaxexig.pdf
    • http://files.westportom.com/uploads/1/3/1/3/131383323/magusetorun.pdf
    • http://files.familieshelpingfamiliessolanocounty.com/uploads/1/3/2/3/132303041/lofudevuju.pdf
    • https://cdn.shopify.com/s/files/1/0428/2672/7580/files/17231781267.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3758/files/20926343643.pdf
    • https://cdn.shopify.com/s/files/1/0434/8729/7696/files/rawigowiwek.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/damegadunuje.pdf
    • https://cdn.shopify.com/s/files/1/0431/3910/4917/files/94519945879.pdf
    • https://cdn.shopify.com/s/files/1/0438/0796/5345/files/marginal_of_bivariate_normal_distribution.pdf
    • https://cdn.shopify.com/s/files/1/0433/9331/9068/files/gisaner.pdf
    • https://cdn.shopify.com/s/files/1/0429/8912/5791/files/city_of_davis_recreation.pdf
    • https://cdn.shopify.com/s/files/1/0435/3818/6394/files/2d_and_3d_seismic_data_acquisition.pdf
    • https://cdn.shopify.com/s/files/1/0432/4638/7367/files/beatles_all_songs_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0435/4048/0164/files/wazibebupirebu.pdf
    • https://cdn.shopify.com/s/files/1/0428/1267/0111/files/salt_shaker_classic_wow.pdf
    • https://cdn.shopify.com/s/files/1/0435/4870/4917/files/62943546712.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_off0000678d.bin
bfe06b869dbb55dbe2e2cb68e0dbc21dd5d0efd0fc7c6abe176da5d3f67cdf5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x678D 5396 bytes
font_01_sfnt_off000079f3.bin
43dc07fee99faa4754d8b80e438ad01f3fac7356df7a0b0dc9561c364dc2992d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79F3 10348 bytes

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