Malicious PDF — malware analysis report

Static analysis result for SHA-256 a453d5b5afebae27…

MALICIOUS

PDF

67.3 KB Created: 2020-08-07 05:38:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5bcaf5bc51ac3298767a83900885b04 SHA-1: 35d02f95deda793df53ffcec7af9460afa629a0f SHA-256: a453d5b5afebae279c433d98c4014f0c937ec0e5cfa8d31fd12f88ed2103a250
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a high density of external links, many pointing to Shopify domains, suggesting a link farm for SEO manipulation. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is likely the primary malicious payload delivery mechanism. The document body, though heavily obfuscated, contains the same URL as the malicious link, reinforcing the lure. No scripts were extracted from this sample.

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=organisation+of+shoot+apical+meristem+pdf
    • http://files.get2steeping.com/uploads/1/3/0/7/130739782/vipedofijujugeb.pdf
    • http://files.kingstonwestdental.ca/uploads/1/3/0/7/130738596/aa41de0f.pdf
    • http://files.northernbeachescleanupcrew.com/uploads/1/3/1/8/131856919/9467fe8.pdf
    • http://files.dragomirdogs.com/uploads/1/3/2/7/132741181/38d53e64c.pdf
    • https://cdn.shopify.com/s/files/1/0431/4588/7905/files/vixifik.pdf
    • https://cdn.shopify.com/s/files/1/0429/9046/9283/files/addison_wesley_science_10.pdf
    • https://cdn.shopify.com/s/files/1/0437/6245/0586/files/fitokutur.pdf
    • https://cdn.shopify.com/s/files/1/0431/6420/5216/files/57052383497.pdf
    • https://cdn.shopify.com/s/files/1/0448/0807/7473/files/calle_y_poch_libro.pdf
    • https://cdn.shopify.com/s/files/1/0429/1729/8329/files/42826360265.pdf
    • https://cdn.shopify.com/s/files/1/0433/4528/1183/files/peladesewolezulop.pdf
    • https://cdn.shopify.com/s/files/1/0431/4903/3627/files/formule_magique_pour_attirer_l_argent.pdf
    • https://cdn.shopify.com/s/files/1/0435/6122/2307/files/cbase_math_practice_test.pdf
    • https://cdn.shopify.com/s/files/1/0430/3549/2503/files/revozawetudeke.pdf
    • https://cdn.shopify.com/s/files/1/0434/8713/3860/files/air_pollution_related_articles.pdf
    • https://cdn.shopify.com/s/files/1/0435/1374/1472/files/migotokox.pdf
    • https://cdn.shopify.com/s/files/1/0440/7204/2661/files/95675914234.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_off0000c8cc.bin
e087b7655383f43ee56ebea57910c12b5d1a915d4df404e6b2f8a312f1e2bc98		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC8CC 5596 bytes
font_01_sfnt_off0000dba8.bin
2ac56c65a6c975f3e857313d81e5b235b9fe7cd1f8ff10083a32c46fa8be74b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA8 10668 bytes

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