Malicious PDF — malware analysis report

Static analysis result for SHA-256 f203ef55bbc8fa61…

MALICIOUS

PDF

44.0 KB Created: 2020-10-28 12:01:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28eb3bda94466d14c149a19c77a90bfc SHA-1: 713e4135d890291dd6ca1fad46fa2821a7b9bf81 SHA-256: f203ef55bbc8fa61cab3c90e32e8468e6bd7052a174c28e91c5d70cd4b565ac5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains the same URL and appears to be a lure for users seeking a "language b guide". The presence of numerous other PDF links suggests a link farm or SEO poisoning attempt to distribute malicious content. No scripts were extracted, but the primary threat is the redirection to a malicious site.

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/123?keyword=ib+language+b+guide+2017
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b60e9153-cfa4-4585-93bc-1f31b7cf252b/sing_full_movie_online_free_putlocke.pdf
    • https://cdn.shopify.com/s/files/1/0484/4647/2342/files/radazuvixuwazakugedip.pdf
    • https://s3.amazonaws.com/vuliwisuwig/kamedinibowire.pdf
    • https://uploads.strikinglycdn.com/files/5b9f9585-ce1a-42b4-ad31-9de4fd011c38/90204330982.pdf
    • https://uploads.strikinglycdn.com/files/19671fa3-8e43-4083-960c-d0550119c20a/bayesian_analysis.pdf
    • https://s3.amazonaws.com/vobuturinivi/62368444142.pdf
    • https://uploads.strikinglycdn.com/files/4edd3c55-f033-4f77-9029-6fa38f423ded/bdo_developing_a_new_menu.pdf
    • https://cdn.shopify.com/s/files/1/0266/8186/8462/files/gta_5_bunker_money_guide.pdf
    • https://uploads.strikinglycdn.com/files/41873627-3316-48bd-a362-3661f2798cdb/debavudixeger.pdf
    • https://s3.amazonaws.com/pazifetanegapu/what_is_bangsamoro_organic_law.pdf
    • https://cdn.shopify.com/s/files/1/0481/5916/2521/files/13519238423.pdf
    • https://uploads.strikinglycdn.com/files/4d8c215c-cd46-4384-ab17-c0d3ae270a08/52596468847.pdf
    • https://uploads.strikinglycdn.com/files/3f5d54e6-9a22-4f91-997b-87dd83e5e141/67631649599.pdf
    • https://uploads.strikinglycdn.com/files/0e7f7a08-3daf-40f8-adcd-0ed41e5235eb/54808781127.pdf
    • https://uploads.strikinglycdn.com/files/05c4975e-9c42-4530-9796-e184cdcf1aef/56595098689.pdf
    • https://uploads.strikinglycdn.com/files/5a46d375-c5a3-4785-8f83-3ee799d011d3/36835063098.pdf
    • https://uploads.strikinglycdn.com/files/1d7e1171-4d63-446b-bc02-75f2cb9808c3/65193688037.pdf
    • https://cdn.shopify.com/s/files/1/0266/8540/7408/files/10228632107.pdf
    • https://s3.amazonaws.com/falevi/agricultura_familiar_definio.pdf
    • https://uploads.strikinglycdn.com/files/e543a51f-3988-4acf-bce3-0d2187f4b4df/nasewawovumubekapusogo.pdf
    • https://s3.amazonaws.com/mipeboro/hyderabadi_chicken_dum_biryani_recipe.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_off00006d4a.bin
7ce2a510bab790f093b0c56436da8b6d411e2736083e23d7109278ebd8f94eb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D4A 5200 bytes
font_01_sfnt_off00007f1b.bin
0762fb2c8da534c5e84f5904d5849337564e3ff41777552b4dea81a65b87e573		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F1B 10656 bytes

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