Malicious PDF — malware analysis report

Static analysis result for SHA-256 104ec81123ea53e3…

MALICIOUS

PDF

59.0 KB Created: 2020-08-04 19:04:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5774788e6d27403e4e110c65b6d6a277 SHA-1: dc7bd495a7c92c07bbc5b177e3be1221ba8556a0 SHA-256: 104ec81123ea53e39b2a479d492f0e7ef1c85941132da45a5182597ef1363d63
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, ttraff.com, which is likely used to funnel victims to further malicious content. The document body also contains numerous links to external PDFs, suggesting a link farm or SEO poisoning tactic to attract unsuspecting users. The ML classifier 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.com/pify?keyword=addition+coloring+pages+pdf
    • http://files.pigolin.com/uploads/1/3/0/7/130740211/xamugam-moviji-darugepefare-gowuralaniv.pdf
    • http://files.americaninfousa.net/uploads/1/3/1/6/131606861/7732897.pdf
    • http://files.awwe.org/uploads/1/3/0/7/130738812/dorotimaro.pdf
    • http://files.friedbergrealestateschool.org/uploads/1/3/0/7/130775446/kupajeditelapul.pdf
    • http://files.access7apploud.com/uploads/1/3/1/3/131380288/pepefasosux-faramo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/6405/0332/files/helen_of_troy_1956.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/30617095305.pdf
    • https://cdn.shopify.com/s/files/1/0433/2738/9851/files/birotukevebiwejibesexula.pdf
    • https://cdn.shopify.com/s/files/1/0429/9928/3861/files/29944081743.pdf
    • https://cdn.shopify.com/s/files/1/0433/7877/0078/files/ttw_load_order.pdf
    • https://cdn.shopify.com/s/files/1/0438/9981/4056/files/lefegisosenigemopave.pdf
    • https://cdn.shopify.com/s/files/1/0438/1245/4560/files/lusufuputafujuz.pdf
    • https://cdn.shopify.com/s/files/1/0439/0486/0328/files/juxulu.pdf
    • https://cdn.shopify.com/s/files/1/0438/5302/1334/files/buzakizezeravigek.pdf
    • https://cdn.shopify.com/s/files/1/0427/9785/8972/files/anne_of_green_gables_story_summary.pdf
    • https://cdn.shopify.com/s/files/1/0431/2255/7082/files/arithmetic_sequence_word_problems_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0428/3577/1558/files/mijabewetapunipaga.pdf
    • https://cdn.shopify.com/s/files/1/0433/9862/7495/files/nituru.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_off0000a67f.bin
1be49bd30aac64e2e9dec8560b48d896c35b690476f4e836cbc2461581e493fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA67F 5312 bytes
font_01_sfnt_off0000b8a0.bin
a117d61c924e540bd711133bb33cfb27d0c17fa53e3c20271c593353fbbed4b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB8A0 11356 bytes

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