Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bae9042c828aac1…

MALICIOUS

PDF

53.2 KB Created: 2020-08-19 16:00:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa45bf575a9d8df1038987e7977bdcc6 SHA-1: 0e46d87ade2eda64e4cc8e1b6ee8fa27093e31f3 SHA-256: 8bae9042c828aac12a829d59bce41693b8359e9143d39bd6021ab55534c7ca73
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=merriam+webster+dictionary+free'. Additionally, it features a PDF link farm heuristic, indicating a large number of external links, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily corrupted, contains fragments of the malicious URL and other Shopify links, reinforcing the redirection attempt.

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=merriam+webster+dictionary+free
    • http://rufuranav.philmancusi.com/uploads/1/3/2/7/132710714/degotuvi.pdf
    • http://files.granbyag.org/uploads/1/3/0/7/130739239/fajakamekafuk.pdf
    • https://cdn.shopify.com/s/files/1/0439/4608/2472/files/46668448211.pdf
    • https://cdn.shopify.com/s/files/1/0437/9960/9505/files/polymerase_chain_reaction.pdf
    • https://cdn.shopify.com/s/files/1/0434/1334/0312/files/66111399401.pdf
    • https://cdn.shopify.com/s/files/1/0432/2725/0850/files/20165847867.pdf
    • https://cdn.shopify.com/s/files/1/0432/3796/5986/files/rimworld_a16_mods.pdf
    • https://cdn.shopify.com/s/files/1/0440/2266/1278/files/chinese_visa_form_perth.pdf
    • https://cdn.shopify.com/s/files/1/0437/0392/6938/files/kifal.pdf
    • https://cdn.shopify.com/s/files/1/0431/0230/6468/files/dagijikazubago.pdf
    • https://cdn.shopify.com/s/files/1/0437/6385/9610/files/the_ripple_effect_greg_wells.pdf
    • https://cdn.shopify.com/s/files/1/0437/3577/7445/files/ayyappan_songs_free_yesudas_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0430/2356/4957/files/ham_radio_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0429/2627/6775/files/waletumavelojinibuz.pdf
    • https://cdn.shopify.com/s/files/1/0427/6856/4380/files/switzerland_crs_reporting_countries.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000621a.bin
2b16878efb083ad5144c7b4a80df71256cf00c9c31a756b67828b9dad43d9d4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x621A 5264 bytes
font_01_sfnt_off000073eb.bin
cf50d13c5c21d2e34fba0d9dd21119d4839fc35fdaebfe62cbacf51850cc328d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73EB 1936 bytes
font_02_sfnt_off00007d2a.bin
e447272d0f064969698c2373e1270056f68c60878b26138c20d54a15de8d326c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D2A 10748 bytes
font_03_sfnt_off0000a1f0.bin
9c0f9d257bc7da6223548c8ccacc9507412696804e36b62896ad6684a812f4c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA1F0 16820 bytes
font_04_sfnt_off0000b8e4.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB8E4 4324 bytes

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