Malicious PDF — malware analysis report

Static analysis result for SHA-256 91f8f45d323cbad3…

MALICIOUS

PDF

45.1 KB Created: 2020-08-12 03:42:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f865c0d1b6b24b887b0a5d58839f9ea7 SHA-1: 6344f59f203d6d7b9381b761b71db0b85fcf14b3 SHA-256: 91f8f45d323cbad3ceb2cf769f59906d5f15db5b35702466185f840ca0da31b7
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many of which are disguised as legitimate PDF files hosted on Shopify. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.cc/pify?keyword=islanders+schedule+pdf'. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same malicious URL and several benign-looking Shopify URLs, suggesting a lure to trick users into clicking malicious links.

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=islanders+schedule+pdf
    • http://vowebofew.greatmausoleums.com/uploads/1/3/1/4/131482962/vanerudixagote-nujatuwo-dasuj-xasinosiku.pdf
    • http://kadopunur.northernumpires.com/uploads/1/3/2/6/132695615/8419957.pdf
    • http://files.magicalmary3.com/uploads/1/3/1/3/131381374/10f70.pdf
    • http://files.ourmobilehealth.com/uploads/1/3/1/3/131384489/wamurojodawetudalu.pdf
    • http://radab.harvesttruths.com/uploads/1/3/1/4/131407995/kizuzifakume-telexuduf-pujopitisixe.pdf
    • https://cdn.shopify.com/s/files/1/0433/8289/8840/files/geometrical_optics_for_iit_jee.pdf
    • https://cdn.shopify.com/s/files/1/0432/6083/8050/files/zamimagafugifiwazo.pdf
    • https://cdn.shopify.com/s/files/1/0448/6791/1842/files/cause_and_effect_worksheets_2nd_grade.pdf
    • https://cdn.shopify.com/s/files/1/0432/6742/4412/files/81648703744.pdf
    • https://cdn.shopify.com/s/files/1/0433/2804/5209/files/power_of_attorney_arkansas.pdf
    • https://cdn.shopify.com/s/files/1/0437/2099/9064/files/fuvatenekutudal.pdf
    • https://cdn.shopify.com/s/files/1/0436/0221/5074/files/gigodoloxaludujoremivib.pdf
    • https://cdn.shopify.com/s/files/1/0431/9094/3904/files/golifupovezolataxu.pdf
    • https://cdn.shopify.com/s/files/1/0432/2295/8248/files/45527347646.pdf
    • https://cdn.shopify.com/s/files/1/0437/8260/2914/files/27011352592.pdf
    • https://cdn.shopify.com/s/files/1/0434/3142/8248/files/wonipuranijafufofedasew.pdf
    • https://cdn.shopify.com/s/files/1/0433/6379/5096/files/supazezujezobar.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_off00006f71.bin
cb19d12a9269f742ae2eeaa287a1ab4819ef7bba0a9f465f661a988f0dbd96af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F71 5180 bytes
font_01_sfnt_off000080fb.bin
7dc5a66f20919eb4718d394a3194e7eddb27697507d6c69dc7279a2f0842f519		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80FB 11912 bytes

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