Malicious PDF — malware analysis report

Static analysis result for SHA-256 923dd4d7ed0c9a93…

MALICIOUS

PDF

42.2 KB Created: 2020-08-11 23:39:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0cad37bc06e6537b09f9a970b9be099a SHA-1: 6ebd6f994bc6ae3ea187b11f1bcf8ed5c2abadbc SHA-256: 923dd4d7ed0c9a9322517cd925545b3ba80735c2541787d48220ff23f29d1bd2
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to domains associated with link farms and redirectors, such as ttraff.ru. The document body, though heavily obfuscated, contains a URL that appears to be a lure for 'essential academic vocabulary answer key pdf'. The ML classifier strongly indicated maliciousness, and the PDF structure itself is indicative of SEO-based spam campaigns designed to drive traffic to malicious sites.

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=essential+academic+vocabulary+answer+key+pdf
    • http://mivutija.vietnamunitedfc.org/uploads/1/3/0/8/130814004/886bab0.pdf
    • http://files.eastcoastcoachingandconsulting.ca/uploads/1/3/2/6/132681928/tunatunokuxuju.pdf
    • http://files.brightonfd.com/uploads/1/3/0/8/130874691/zidunakixer-nuzewinubopu.pdf
    • http://ribasa.edmtool.com/uploads/1/3/1/4/131407222/bokepe.pdf
    • http://files.hillcountryimaging.com/uploads/1/3/2/7/132712154/raludonazijawot-xovadifazalev-powojurifanekuz.pdf
    • https://cdn.shopify.com/s/files/1/0437/4672/1946/files/gekofawusi.pdf
    • https://cdn.shopify.com/s/files/1/0432/6768/6556/files/3075357199.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tefabojukiva.pdf
    • https://cdn.shopify.com/s/files/1/0428/5631/7091/files/64273673329.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/31321710084.pdf
    • https://cdn.shopify.com/s/files/1/0427/9199/3500/files/nirolokogixuliwo.pdf
    • https://cdn.shopify.com/s/files/1/0431/2167/2356/files/kumes.pdf
    • https://cdn.shopify.com/s/files/1/0448/2033/2705/files/microwave_corn_on_the_cob_wax_paper.pdf
    • https://cdn.shopify.com/s/files/1/0429/5180/3033/files/fajanozexozapogonofuwe.pdf
    • https://cdn.shopify.com/s/files/1/0432/9131/2288/files/zuxipovu.pdf
    • https://cdn.shopify.com/s/files/1/0433/4754/2165/files/d20_blood_and_guts.pdf
    • https://cdn.shopify.com/s/files/1/0439/8442/1022/files/76975064532.pdf
    • https://cdn.shopify.com/s/files/1/0436/8557/6857/files/3_phase_induction_motor_speed_control_methods.pdf
    • https://cdn.shopify.com/s/files/1/0427/6905/5911/files/pozowudoze.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
stream_004_off0000633f.bin
c43c57f812eda1612cb6eb8a86495345be4e842d69fd0b0d8478942f4e7d0578		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x633F 5716 bytes
font_01_sfnt_off000076b8.bin
9db2c12f966864ef53b49b86983c44cd6deb3290696d7fd36955c34bea402a30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76B8 10612 bytes

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