Malicious PDF — malware analysis report

Static analysis result for SHA-256 352e5dcc6493f9e2…

MALICIOUS

PDF

37.0 KB Created: 2020-08-17 16:51:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9a01597a7e573313f994bc50fa1c944 SHA-1: a4cc129e8f4315c2978cdc44385119adbd2f4aa5 SHA-256: 352e5dcc6493f9e28664f8633d7de88ec0e71823a3df37effe598ec2cbe3212e
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to a link farm hosted on cdn.shopify.com, and one critical link to a known malicious redirector at ttraff.ru. The document body, though heavily obfuscated, contains references to the redirector URL and other PDF files, suggesting a lure to download further malicious content. The ML classifier strongly supports the malicious verdict.

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=boating+weather+report+gold+coast
    • http://xizukaxob.rionevans.com/uploads/1/3/2/6/132696212/db806997cef.pdf
    • http://files.eringipfordfreelance.com/uploads/1/3/1/4/131437513/vivaxofaver_tiguvixoxet_vuvaxe.pdf
    • http://fematep.aauwbakersfield.com/uploads/1/3/1/4/131437657/rekemare_sibanil_wupuguguletal_dorekutisuneza.pdf
    • http://files.duarteband.com/uploads/1/3/1/8/131858540/vigasedibawugod.pdf
    • http://nogumo.thefightchronicle.com/uploads/1/3/1/3/131384244/fowatinurapudewu.pdf
    • https://cdn.shopify.com/s/files/1/0429/6058/4870/files/vapagowujezusimur.pdf
    • https://cdn.shopify.com/s/files/1/0434/5298/9605/files/pajivufarasajaranetaviga.pdf
    • https://cdn.shopify.com/s/files/1/0429/8529/1937/files/pdf_split_portable_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/8575/8628/files/ludetagezesewomodipab.pdf
    • https://cdn.shopify.com/s/files/1/0433/1434/8197/files/96729564643.pdf
    • https://cdn.shopify.com/s/files/1/0433/8699/4855/files/da_31_xfdl.pdf
    • https://cdn.shopify.com/s/files/1/0440/3278/6597/files/falulagajeboxobak.pdf
    • https://cdn.shopify.com/s/files/1/0433/5858/4986/files/autocad_assembly_drawing_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0428/2561/3475/files/61689247562.pdf
    • https://cdn.shopify.com/s/files/1/0438/7792/5019/files/lupudore.pdf
    • https://cdn.shopify.com/s/files/1/0430/6426/2818/files/kuxugirejiwonefaf.pdf
    • https://cdn.shopify.com/s/files/1/0434/9083/6645/files/rotolizuwagenizaled.pdf
    • https://cdn.shopify.com/s/files/1/0437/6113/9861/files/3_2_as_a_decimal.pdf
    • https://cdn.shopify.com/s/files/1/0438/9765/1352/files/ibew_practice_test_free.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_off0000520d.bin
873629307a7b4bab3fb33959a669c8a429a59a089b983fa0844cce09a6ce0c4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x520D 5476 bytes
font_01_sfnt_off000064ae.bin
85aef559c4e56d1db9621a75b633a33f2799bf598fb6fe60134af8ab327488f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64AE 9964 bytes

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