Malicious PDF — malware analysis report

Static analysis result for SHA-256 67a3f07ba23b72b9…

MALICIOUS

PDF

49.1 KB Created: 2020-08-11 11:50:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 55fa064dd2fb59e25273a4fc82194e88 SHA-1: 8831ab685e31fe7ec1abe8d5d0c8b9a9dbb231e9 SHA-256: 67a3f07ba23b72b9ddf010dde17736cf0be2e4ccfe1b7b5d6bfe56ad28e3055d
154 Risk Score

Malware Insights

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

The PDF contains a link to a redirector service, which is a common tactic for distributing malicious content. The document body, though heavily obfuscated, contains URLs that appear to be part of a link farm designed to attract traffic. 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.ru/pify?keyword=cracking+the+code+interview+github+pdf
    • http://renejeb.lpethelphoto.com/uploads/1/3/1/0/131070420/89c41a8bd.pdf
    • http://files.sweetnspicecandles.ca/uploads/1/3/2/7/132710676/9273107.pdf
    • http://rexutew.alfredocarlos.com/uploads/1/3/2/6/132681947/bejoxexufarasit.pdf
    • http://files.love-lore.com/uploads/1/3/2/6/132682070/3833cbc9fc5cf.pdf
    • http://files.gardenspotrentals.net/uploads/1/3/2/6/132681938/finefenusavat.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/4484/8295/files/medepo.pdf
    • https://cdn.shopify.com/s/files/1/0430/8421/8532/files/segavunawowozu.pdf
    • https://cdn.shopify.com/s/files/1/0430/8942/8637/files/52617276496.pdf
    • https://cdn.shopify.com/s/files/1/0431/3802/3581/files/37049920115.pdf
    • https://cdn.shopify.com/s/files/1/0433/6916/9054/files/attestation_sur_l_honneur_de_prise_en_charge.pdf
    • https://cdn.shopify.com/s/files/1/0437/4659/0872/files/definition_of_motivation_in_education.pdf
    • https://cdn.shopify.com/s/files/1/0428/6421/4182/files/ridol.pdf
    • https://cdn.shopify.com/s/files/1/0429/1526/6723/files/pawibebab.pdf
    • https://cdn.shopify.com/s/files/1/0437/4711/5157/files/58065362891.pdf
    • https://cdn.shopify.com/s/files/1/0437/4642/7034/files/tiperozazalof.pdf
    • https://cdn.shopify.com/s/files/1/0438/1809/0653/files/45749403197.pdf
    • https://cdn.shopify.com/s/files/1/0427/5775/0951/files/devuvope.pdf
    • https://cdn.shopify.com/s/files/1/0429/2175/4787/files/77045618197.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000641d.bin
127b44c9f93874c96d25eb7ddc4688780d8877ce931cf296363fb5748d8d514b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x641D 6744 bytes
font_01_sfnt_off00007504.bin
9df52b2afd131650ecc4a3ac01e9c95dce529881e8e5fe0e94156120b46d69db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7504 5468 bytes
font_02_sfnt_off0000879a.bin
89993ed4fac3537dc4c7561b80d76631271cc5befb3c9e9f7e483d52a3ed0447		 pdf-font-stream PDF embedded font (sfnt) at offset 0x879A 2524 bytes
font_03_sfnt_off0000928c.bin
5d51dc97f07d06202843da4e170aee24934497d6d6ac5ea6ff3803d11098323a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x928C 10360 bytes

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