Malicious PDF — malware analysis report

Static analysis result for SHA-256 a53b20cb0ae899d8…

MALICIOUS

PDF

51.1 KB Created: 2020-08-25 08:20:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f5de5e45372bee800ac6768ce6cf8bb6 SHA-1: 334b10eb9ab7ac061aa52da347b2602bb995fc30 SHA-256: a53b20cb0ae899d8784b23fa51b53d4b93ff9ffd559be49fc4e9e4d158d3c4b4
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains embedded links, one of which, https://ttraff.ru/pify?keyword=annual+leave+schedule+format+excel, is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting the primary intent is to lure the user into clicking this link. The presence of numerous other links to Shopify domains, while some are benign, contributes to a link farm pattern, potentially for SEO manipulation or to obscure the malicious destination.

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=annual+leave+schedule+format+excel
    • http://files.colstripschoolsdigital.org/uploads/1/3/0/7/130739524/2507646.pdf
    • https://cdn.shopify.com/s/files/1/0439/1315/0632/files/history_of_guru_nanak_dev_ji_in_punjabi.pdf
    • https://cdn.shopify.com/s/files/1/0428/3065/9750/files/xutolumokunuluropogena.pdf
    • https://cdn.shopify.com/s/files/1/0431/7003/7917/files/vawudawanalinakap.pdf
    • https://cdn.shopify.com/s/files/1/0433/4790/2622/files/3267814168.pdf
    • https://cdn.shopify.com/s/files/1/0436/4235/5865/files/gosinovi.pdf
    • https://cdn.shopify.com/s/files/1/0434/5259/6374/files/posapudaxipisenaf.pdf
    • https://cdn.shopify.com/s/files/1/0432/2308/9307/files/52817332892.pdf
    • https://cdn.shopify.com/s/files/1/0439/0912/0152/files/58350022515.pdf
    • https://cdn.shopify.com/s/files/1/0435/8491/3565/files/systemic_lupus_erythematosus_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0435/8022/7747/files/catholic_ash_wednesday_fasting_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0437/5393/0901/files/raluzakelepoje.pdf
    • https://cdn.shopify.com/s/files/1/0427/6797/4556/files/12252146935.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000067f8.bin
808e5b7f361be299c10df584662b32e6cacfe852275ed54f127bd21a020281f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67F8 5376 bytes
font_01_sfnt_off00007a12.bin
7c3bcd168744c31b60e86cd07941774fa6286639b8690e4c2c438bb764a3769c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A12 2280 bytes
font_02_sfnt_off00008448.bin
1cf497e91eb7bb49ed3fac2a1afbfcfc79217be5ace46ad0449aadc3b5c52f26		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8448 10656 bytes
font_03_sfnt_off0000a91d.bin
7e0863d6dcdfe3ce59f67395a06e5e8634226e44f713773c85e494ff6d119ee1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA91D 16344 bytes

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