Malicious PDF — malware analysis report

Static analysis result for SHA-256 5449a2490039a3c6…

MALICIOUS

PDF

58.6 KB Created: 2020-08-16 18:42:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5c36b8d7a4e1bc04d02a78063625550 SHA-1: 8a431a00cb80924d05ba5599cbaacfaa2c0352f3 SHA-256: 5449a2490039a3c6d8d0d23fe6d1567ded40902e914d23ac919d62827d8a48f6
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, also contains the URL 'https://ttraff.ru/pify?keyword=hydrate+practice+problems+worksheet+with+answers', suggesting a lure to a potentially malicious site. The presence of numerous other links to external PDFs, many hosted on Shopify, indicates a link farm strategy, likely for SEO manipulation or to host further malicious content.

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=hydrate+practice+problems+worksheet+with+answers
    • http://files.cotonevineyards.com/uploads/1/3/0/7/130740521/jitef.pdf
    • http://files.wouldgodmilkagoat.com/uploads/1/3/1/0/131071243/gibegonoritusaged.pdf
    • http://files.ssaohiostate.com/uploads/1/3/1/4/131437363/megefutobenux_jenubigi.pdf
    • http://files.accemployees.com/uploads/1/3/1/4/131453636/53945fae94.pdf
    • http://files.belmenphotography.com.au/uploads/1/3/0/7/130738841/sibedazura.pdf
    • https://cdn.shopify.com/s/files/1/0430/7084/9181/files/runerubamedazepamefurase.pdf
    • https://cdn.shopify.com/s/files/1/0431/4267/6648/files/celta_reading_lesson_plan.pdf
    • https://cdn.shopify.com/s/files/1/0431/2216/3876/files/14832833782.pdf
    • https://cdn.shopify.com/s/files/1/0435/4116/8283/files/wamuxukedekuj.pdf
    • https://cdn.shopify.com/s/files/1/0434/1301/2641/files/fapuwoter.pdf
    • https://cdn.shopify.com/s/files/1/0430/8510/3255/files/botidal.pdf
    • https://cdn.shopify.com/s/files/1/0431/4647/7725/files/purcell_electricity_and_magnetism.pdf
    • https://cdn.shopify.com/s/files/1/0440/2718/3269/files/equations_worksheet_ks3.pdf
    • https://cdn.shopify.com/s/files/1/0436/0772/0093/files/xifogatewevokek.pdf
    • https://cdn.shopify.com/s/files/1/0438/0576/9888/files/dijijimaxutin.pdf
    • https://cdn.shopify.com/s/files/1/0441/2496/2968/files/budget_planning_sheet.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_off00007c07.bin
0fd078b94131d7bb8371dc28436fbb9654c24fcbdeb968988bf9ca9988e4dbf6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C07 5460 bytes
font_01_sfnt_off00008e6b.bin
68dea3807605d84ae277cf6774740d0b0a1f7f00d0fa9d111019b68171816222		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E6B 13684 bytes
font_02_sfnt_off0000b9ea.bin
c43c81af3addadc619f1b50b0eb79006c69e58cb90abf43f7a5fbd940e22698c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB9EA 16060 bytes
font_03_sfnt_off0000ce7e.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE7E 4324 bytes

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