Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d07919b68c87268…

MALICIOUS

PDF

43.5 KB Created: 2020-08-20 04:38:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27e2b7f355a2e8aec551ed4e99428b61 SHA-1: 3106a488535d734e8f1f2b8b0a8d19eb13a6bd9d SHA-256: 3d07919b68c8726823f1d7954f9e00f69cc73c88bbda7a66259e5c87719f7764
154 Risk Score

Malware Insights

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

The PDF contains a high density of external links, many of which point to what appears to be a link farm designed for SEO manipulation. One critical heuristic identified a link to a known malicious redirector, 'ttraff.cc', which is presented to the user as a 'free for pdf to excel converter'. This suggests a social engineering tactic to drive traffic to malicious sites. The ML classifier also 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=free++for+pdf+to+excel+converter
    • http://mebewuro.treatreads.com/uploads/1/3/0/7/130774982/nedukipaba.pdf
    • http://files.monicasscarfs.com/uploads/1/3/1/4/131437702/4260854.pdf
    • http://files.sharingstitches.com/uploads/1/3/1/0/131070072/608454.pdf
    • http://files.charleslpearson.net/uploads/1/3/1/8/131871501/1553476.pdf
    • https://cdn.shopify.com/s/files/1/0432/9937/3214/files/beseririkaso.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/68876684382.pdf
    • https://cdn.shopify.com/s/files/1/0427/4746/1788/files/android_data_folder_no_root.pdf
    • https://cdn.shopify.com/s/files/1/0431/8117/9029/files/91317743607.pdf
    • https://cdn.shopify.com/s/files/1/0434/3165/7638/files/wamedab.pdf
    • https://cdn.shopify.com/s/files/1/0428/3580/4319/files/2311245022.pdf
    • https://cdn.shopify.com/s/files/1/0435/4598/5192/files/rounding_to_two_decimal_places.pdf
    • https://cdn.shopify.com/s/files/1/0430/4633/8709/files/nepuvadifanafogibivu.pdf
    • https://cdn.shopify.com/s/files/1/0433/2768/4760/files/35165415308.pdf
    • https://cdn.shopify.com/s/files/1/0431/7170/9092/files/congestive_cardiac_failure.pdf
    • https://cdn.shopify.com/s/files/1/0435/3484/4059/files/70093200564.pdf
    • https://cdn.shopify.com/s/files/1/0427/6623/7852/files/lujinozuv.pdf
    • https://cdn.shopify.com/s/files/1/0437/9751/2354/files/deformation_of_the_crust_continental_drift.pdf
    • https://cdn.shopify.com/s/files/1/0435/3579/4340/files/apartment_lease_application.pdf
    • https://cdn.shopify.com/s/files/1/0434/6268/8918/files/english_alphabet_worksheet.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000060e2.bin
5476f6779b99bc5035a0356c3cdacdaf73581bf82fa2803c0de597fe93f64c48		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60E2 4584 bytes
font_01_sfnt_off0000708a.bin
26277a239ffe8188585b27a6526713107707cc29b3c772ca56360ae8513cdb96		 pdf-font-stream PDF embedded font (sfnt) at offset 0x708A 9920 bytes
font_02_sfnt_off0000927f.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x927F 4324 bytes

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