Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f74810dbcfc2905…

MALICIOUS

PDF

127.4 KB Created: 2020-08-12 05:34:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 328560cb9e9229351ce676b133c5019c SHA-1: 3f27af23e99054e82d7e29939baab1a36a4f1715 SHA-256: 1f74810dbcfc2905230ecf40c33d4c97552f5e5af3e9ae32abb3f85ead7f1334
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=audio+power+amplifier+design+pdf'. This indicates the document's primary purpose is to trick the user into visiting a malicious URL. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same URL, reinforcing the lure.

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=audio+power+amplifier+design+pdf
    • http://files.gloucesterunitingchurch.org/uploads/1/3/2/6/132681233/jafotu.pdf
    • http://files.capstoneonline.com/uploads/1/3/0/8/130814596/cdb1abea4c8dc6.pdf
    • http://files.gavinwelshfarriery.co.nz/uploads/1/3/2/6/132696174/zubedekika.pdf
    • http://files.stresswiseatwork.co.uk/uploads/1/3/1/6/131607163/faxuvavorano_rasunab_saroxarutenig.pdf
    • https://cdn.shopify.com/s/files/1/0429/4000/6559/files/89530579525.pdf
    • https://cdn.shopify.com/s/files/1/0433/3400/8987/files/rexitumitoxigam.pdf
    • https://cdn.shopify.com/s/files/1/0432/4261/9035/files/86640242133.pdf
    • https://cdn.shopify.com/s/files/1/0429/8987/9445/files/49808152266.pdf
    • https://cdn.shopify.com/s/files/1/0431/7026/7291/files/stay_hungry_stay_foolish_drive.pdf
    • https://cdn.shopify.com/s/files/1/0428/5153/2963/files/ducky_macro_2._0.pdf
    • https://cdn.shopify.com/s/files/1/0430/5911/8229/files/79397349444.pdf
    • https://cdn.shopify.com/s/files/1/0436/1761/6034/files/metebibusis.pdf
    • https://cdn.shopify.com/s/files/1/0433/7162/6659/files/vikekupewusupejimov.pdf
    • https://cdn.shopify.com/s/files/1/0437/5815/7982/files/84946539994.pdf
    • https://cdn.shopify.com/s/files/1/0430/8028/6372/files/seborewusededuviwabija.pdf
    • https://cdn.shopify.com/s/files/1/0432/5690/5885/files/poxaxevipafixekimuvixole.pdf
    • https://cdn.shopify.com/s/files/1/0431/0558/3266/files/commercial_building_design_project.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a413.bin
8574919c7c8a9f024103958ce015253c5a24b8e646cdb5f787658918713f2b2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A413 3080 bytes
font_01_sfnt_off0001af1b.bin
dcae41f3f94fe42a360e2fa5e1db8e050c844b2edfab1215e3204ed2cefbd610		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1AF1B 5444 bytes
font_02_sfnt_off0001c19b.bin
9f7799c2ce90ac90213ac3cbcead375736b6b64fba5fa4c9959a19972e1ed862		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C19B 14328 bytes

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