Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc8e1093364f43f3…

MALICIOUS

PDF

38.0 KB Created: 2020-08-17 11:24:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f768729a24a6a2833a82c1f94aed9c63 SHA-1: db4f8e565a267cab5ec001556465e891ef71d7fe SHA-256: dc8e1093364f43f3e8cbd4259a2de00ac2590226f7c5ca419da9964f0e472ea8
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is likely intended to lead the user to a malicious site. The document body, though heavily obfuscated, contains the URL and appears to be a lure for a "Bruker mpa nir manual". The presence of numerous embedded URLs, many pointing to Shopify, suggests a link farm or redirection strategy. No scripts were extracted, limiting the analysis of direct execution capabilities.

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.com/pify?keyword=bruker+mpa+nir+manual
    • http://files.ronaldgabrielsen.com/uploads/1/3/1/6/131606291/dulixagolixivu-mudivefo.pdf
    • http://files.nigelbuxtonartist.com/uploads/1/3/1/0/131070161/gizupibipuma.pdf
    • http://sixuseti.staffordcounty.org/uploads/1/3/1/6/131637136/720294ffc549.pdf
    • http://files.marinwoodturningandcompany.com/uploads/1/3/1/4/131454521/ratikoxujoberu.pdf
    • http://files.learnguitar4fun.com/uploads/1/3/1/8/131856381/8522082.pdf
    • https://cdn.shopify.com/s/files/1/0440/0683/4334/files/robonegagadajizulabasevor.pdf
    • https://cdn.shopify.com/s/files/1/0433/9177/8965/files/37458707138.pdf
    • https://cdn.shopify.com/s/files/1/0430/6544/2457/files/58653026390.pdf
    • https://cdn.shopify.com/s/files/1/0435/4539/5368/files/53216028386.pdf
    • https://cdn.shopify.com/s/files/1/0428/5156/5724/files/bagatovag.pdf
    • https://cdn.shopify.com/s/files/1/0432/2738/1924/files/45142171995.pdf
    • https://cdn.shopify.com/s/files/1/0428/7227/5103/files/23914154964.pdf
    • https://cdn.shopify.com/s/files/1/0427/9474/6023/files/lalamikebajibokukusirusij.pdf
    • https://cdn.shopify.com/s/files/1/0435/7488/6563/files/set_timer_for_16_minutes.pdf
    • https://cdn.shopify.com/s/files/1/0448/4002/6273/files/and_but_so_because_grammar.pdf
    • https://cdn.shopify.com/s/files/1/0435/4765/6343/files/mekalaredi.pdf
    • https://cdn.shopify.com/s/files/1/0431/6083/0116/files/narasimha_kavacham_lyrics_in_tamil.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_off000056eb.bin
bebb5f501d4dc979f7911bd535d9a020c14d14d6903baece5316bc4b5b1dc7f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56EB 4900 bytes
font_01_sfnt_off0000677f.bin
0bb0c0b118006724cfeeb2d016e258d793a4023f9c0fb5997a13da34de576146		 pdf-font-stream PDF embedded font (sfnt) at offset 0x677F 10508 bytes

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