Malicious PDF — malware analysis report

Static analysis result for SHA-256 438ce61b4866524b…

MALICIOUS

PDF

55.2 KB Created: 2020-08-31 04:08:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 169cca62f15199821d9760228b2e30c1 SHA-1: 7017ca4c8a5e3424fb27e1b1e1b326439ed70ea1 SHA-256: 438ce61b4866524ba0d82fb8564a340da77e49bc89955aee2250011303da87af
152 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to PDF files hosted on Shopify. One of these links, https://ttraff.cc/wix?keyword=how+to+get+to+zakum, is identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and URLs, suggesting an attempt to disguise the malicious intent.

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/wix?keyword=how+to+get+to+zakum
    • https://cdn.shopify.com/s/files/1/0431/8406/2626/files/ping_g25_driver.pdf
    • https://cdn.shopify.com/s/files/1/0432/8987/0491/files/jibodetapigozipubivabobem.pdf
    • https://cdn.shopify.com/s/files/1/0437/7165/8392/files/vasijaxe.pdf
    • https://cdn.shopify.com/s/files/1/0428/3252/7526/files/10509717120.pdf
    • https://static.usrfiles.com/ugd/5be868_180bd54cc3cb45438ceace3b60a6c4bf.pdf
    • https://static.usrfiles.com/ugd/3826db_e128295431b04f4f96a7f6e56d7b4204.pdf
    • https://static.usrfiles.com/ugd/086daf_05601785fe5449d882ea77b235a65068.pdf
    • https://static.usrfiles.com/ugd/b8c837_da29784fddc941709d1303eb22aad9c3.pdf
    • https://cdn.shopify.com/s/files/1/0433/7428/0855/files/68809438056.pdf
    • https://cdn.shopify.com/s/files/1/0427/7387/2807/files/fe_civil_review.pdf
    • https://cdn.shopify.com/s/files/1/0439/1400/2600/files/41092558258.pdf
    • https://cdn.shopify.com/s/files/1/0440/5736/2597/files/bbg_beginner_training.pdf
    • https://cdn.shopify.com/s/files/1/0436/4995/8046/files/fufuwufavagenu.pdf
    • https://cdn.shopify.com/s/files/1/0440/8023/4661/files/sheet_metal_gauge_chart_fractions.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rixiridujafogidubiba.pdf
    • https://cdn.shopify.com/s/files/1/0431/1675/7153/files/relamujijiduk.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
stream_005_off0000a701.bin
375451f34bde8fdab30044adf4a639f1b9e0e15cd6e9905d45f2fc5a41200bfc		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xA701 17576 bytes
font_00_sfnt_off000071bf.bin
3b557f9fbded38f8c3ade31b552eb458fa8664d7574ac0befd455b5363dddf00		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71BF 4592 bytes
font_01_sfnt_off00008186.bin
b011b1b6437d6ac25bb237ab2c98476266dded386ae004ecbd0dff4b72d64df8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8186 10948 bytes
font_03_sfnt_off0000c189.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC189 4324 bytes

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