Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1c6fc493b5040e2…

MALICIOUS

PDF

44.3 KB Created: 2020-08-23 05:13:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3129519cb109bee4809496f5bacb0968 SHA-1: e58e514424c1f499ba932785610061a377c8628b SHA-256: b1c6fc493b5040e2415f8e2c6ec050bb4b086324ebf95839225b52908ab702cc
152 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 of which point to a known malicious redirector. The primary malicious URL identified is https://ttraff.cc/pify?keyword=english+russian+business+dictionary+pdf, which is designed to lead users to harmful content. The ML classifier strongly indicated maliciousness, supporting the heuristic findings.

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=english+russian+business+dictionary+pdf
    • http://files.farmacybotanical.com/uploads/1/3/2/3/132302973/xutitogesafa-lixoreriberexik-larowuwonubola.pdf
    • https://cdn.shopify.com/s/files/1/0438/2038/4416/files/yify_movies_net.pdf
    • https://cdn.shopify.com/s/files/1/0432/3144/5149/files/troybilt_mower_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/3121/5780/files/senujeveg.pdf
    • https://cdn.shopify.com/s/files/1/0441/1500/1496/files/89486167372.pdf
    • https://cdn.shopify.com/s/files/1/0432/0660/7005/files/wanuv.pdf
    • https://cdn.shopify.com/s/files/1/0431/3071/6322/files/8770774680.pdf
    • https://cdn.shopify.com/s/files/1/0433/4233/2057/files/cardiomyopathie_dilate_traitement.pdf
    • https://cdn.shopify.com/s/files/1/0429/5219/6249/files/lazadigisiwijube.pdf
    • https://cdn.shopify.com/s/files/1/0438/0616/3104/files/58158870425.pdf
    • https://cdn.shopify.com/s/files/1/0438/2962/4982/files/23771443353.pdf
    • https://cdn.shopify.com/s/files/1/0430/3824/5017/files/juxaker.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mowajuvide.pdf
    • https://cdn.shopify.com/s/files/1/0430/7678/0192/files/10253129624.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_off00006d53.bin
23d8c8ba455b9104040af73081174203607605dce69605857fc06fa079dff4f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D53 5616 bytes
font_01_sfnt_off00008061.bin
85f70d2b27ecbcb5eddcdbc56e8b92bdc505c567d0411a342bd9587cacb27787
pdf-font-stream PDF embedded font (sfnt) at offset 0x8061 10444 bytes